Parasites, Hosts and Diseases

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Brief Communications

Identification of an Opisthorchis viverrini-like liver fluke from Myanmar: Metacercariae recovered from snakehead fish and adults from an experimentally infected hamster: Woon-Mok Sohn, Bong-Kwang Jung, Keon-Hoon Lee, Sung-Jong Hong, Seung-Hwan Seo, Thi Thi Htoon, Htay Htay Tin, Eun-Hee Shin, Jong-Yil Chai; Parasites Hosts Dis 2025;63(2):174-181.
Published online May 26, 2025; DOI: https://doi.org/10.3347/PHD.24063

A novel fluke species, morphologically resembling Opisthorchis viverrini, was discovered in the Yangon Region, Myanmar. Metacercariae were found in the muscle tissue of 2 snakehead fish species, Mi and Channa striata. The metacercariae were elliptical (average 165×122 μm, n=10), having 2 suckers and a large excretory bladder. Experimental infection of a hamster resulted in the recovery of adult flukes from the bile ducts at day 50 post-infection. Adult flukes were lanceolate, with dimensions of 3.8–6.0 (average 5.1) mm by 1.1–1.2 (1.2) mm (n=10). Morphological characteristics included an oral sucker slightly smaller than the ventral sucker, a long uterus not extending anterior to the ventral sucker, vitelline follicles reaching the anterior ovary level, and 2 deeply lobed testes (4 lobes anteriorly, 5 posteriorly). Eggs were ovoid to elliptical, measuring 26.3–27.5 (26.9) μm in length and 13.8–15.0 (14.6) μm in width (n=10). Despite the close morphological resemblance to O. viverrini, our specimens displayed significant differences, including a more spiraled seminal vesicle, a longer uterus occupying 50%–60% of the body length, a less distinct grouping of vitelline follicles (forming 7–8 groups on each side in O. viverrini), vitelline follicles restricted to the ovary level (beyond the posterior end of the ovary or at anterior testis level in O. viverrini), and smaller metacercariae. We tentatively categorize our specimens as an O. viverrini-like liver fluke potentially parasitizing mammals or birds, highlighting the need for further research. Rigorous molecular analyses and identification of natural definitive hosts are essential to clarify the taxonomic status of this novel parasite.

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Toward resolving cryptic diversity in opisthorchiid flukes: Molecular clarification of an Opisthorchis viverrini-like parasite in Myanmar is urgently needed
Schawanya Kaewpitoon Rattanapitoon, Chutharat Thanchonnang, Nathkapach Kaewpitoon Rattanapitoon
Parasites, Hosts and Diseases.2025; 63(3): 284. CrossRef

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Development of the head collar and collar spines during the larval stages of Isthmiophora hortensis (Digenea: Echinostomatidae): Woon-Mok Sohn, Won-Jae Jung, Eun-Hee Shin, Jong-Yil Chai; Parasites Hosts Dis 2024;62(1):145-150.
Published online February 23, 2024; DOI: https://doi.org/10.3347/PHD.23122

It is uncertain when the head collar and collar spines of Isthmiophora hortensis (Digenea: Echinostomatidae), a zoonotic echinostome species in Far Eastern Asia, develop during its larval stages. In this study, the appearance of the head collar and collar spines was studied using light and scanning electron microscopy in cercariae and metacercariae experimentally obtained from freshwater snails (Lymnaea pervia) and tadpoles (Rana nigromaculata), respectively. The cercariae were shed from the snail on day 30 after exposure to laboratory-hatched miracidia. Metacercariae were obtained from the experimental tadpoles at 3, 6, 12, 15, 20, 24, 26, and 30 h after exposure to the cercariae. The head collar was already visible in the cercarial stage, although its degree of development was weak. However, collar spines did not appear in the cercarial stage and even in the early metacercarial stage less than 24 h postinfection in tadpoles. Collar spines became visible in the metacercariae when they grew older than 24 h. It was concluded that the head collar of I. hortensis developed early in the cercarial stage, but the development of collar spines did not occur until the worms became 24-h-old metacercariae in our experimental setting. Counting the number of collar spines was concluded as an unfeasible diagnostic method for I. hortensis cercariae when they are shed from the snail host.

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Mini Review

Infection characteristics of Metagonimus species (Digenea: Heterophyidae) metacercariae in fish from major rivers of Korea: Woon-Mok Sohn; Parasites Hosts Dis 2024;62(1):1-29.
Published online February 23, 2024; DOI: https://doi.org/10.3347/PHD.23096

This article analyzed the infection characteristics of metacercariae of Metagonimus spp. (MsMc) in fish from 9 major water systems in Korea. A total of 19,568 fish in 87 species were examined over a period of 10 years (2011–2020). MsMc were detected in fish from all 44 survey areas in 9 water systems. Most of the surveyed sites showed very low and low infection levels (66.7%), while 33.3% of the areas, such as Tamjin-gang and Seomjin-gang, revealed moderate and high infection levels. High endemicity depends on the abundance of susceptible fish species, especially sweet smelt (Plecoglosus altivelis). The susceptibility index (SI) with MsMc in index fish, Zacco spp., was very low and low levels in 62.0%, moderate in 28.0%, and high in 10.0% regions. The SI was highest in the following order: Yeongam-cheon (283.8), Hoeng-cheon (192.3), Togyo-jeosuji (131.2), Deokcheon-gang (119.1), and Joyang-gang (106.3). The recent infection status of MsMc in P. altivelis was analyzed by the survey localities. In addition, except for P. altivelis, 9 fish species were highly infected with MsMc in some survey areas, including Zacco platypus, Z. koreanus, Z. temminckii, Opsariichthys uncirostris, Rhynchocypris oxycephalus, Carassius auratus, Acheilognathus rhombeus, Onchorhynchus masou, and Tribolodon hakonensis. In Korea, 74 fish species (15 families) are collectively listed as second intermediate hosts of Metagonimus spp. This review provides several novel characteristics of MsMc infection and clarifies the fish species of second intermediate host of Metagonimus spp. in this country.

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Detection of intestinal parasites in leopard cat fecal samples using shotgun metagenomics
Jun Ho Choi, Singeun Oh, Myung-hee Yi, Dongjun Kang, Du-Yeol Choi, Xavier Chavarria, Arwa Shatta, Yoon Hee Cho, Seongjun Choe, Seung-Hun Lee, Ju Yeong Kim
Parasites, Hosts and Diseases.2025; 63(4): 349. CrossRef

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Original Article

Treatment with Extracellular Vesicles from Giardia lamblia Alleviates Dextran Sulfate Sodium-Induced Colitis in C57BL/6 Mice: Hyun Jung Kim, Young-Ju Lee, Seon-Ok Back, Shin-Hyeong Cho, Hee-Il Lee, Myoung-Ro Lee; Korean J Parasitol 2022;60(5):309-315.
Published online October 21, 2022; DOI: https://doi.org/10.3347/kjp.2022.60.5.309

Inflammatory bowel disease (IBD) is a chronic and recurrent illness of the gastrointestinal tract. Treatment of IBD traditionally involves the use of aminosalicylic acid and steroids, while these drugs has been associated with untoward effects and refractoriness. The absence of effective treatment regimen against IBD has led to the exploration of new targets. Parasites are promising as an alternative therapy for IBD. Recent studies have highlighted the use of parasite-derived substances, such as excretory secretory products, extracellular vesicles (EVs), and exosomes, for the treatment of IBD. In this report, we examined whether EVs secreted by Giardia lamblia could prevent colitis in a mouse model. G. lamblia EVs (GlEVs) were prepared from in vitro cultures of Giardia trophozoites. Clinical signs, microscopic colon tissue inflammation, and cytokine expression levels were detected to assess the effect of GlEV treatment on dextran sulfate sodium (DSS)-induced experimental murine colitis. The administration of GlEVs prior to DSS challenge reduced the expression levels of pro-inflammatory cytokines, including tumor necrosis factor alpha, interleukin 1 beta, and interferon gamma. Our results indicate that GlEV can exert preventive effects and possess therapeutic properties against DSS-induced colitis.

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Role of parasite extracellular vesicles/exosomes in the interaction between hosts and virus-infected flagellate protozoa: Progress and prospects
Lu Li, Xiaocen Wang, Jianhua Li, Xichen Zhang, Xin Li, Nan Zhang, Lili Cao, Pengtao Gong
Animals and Zoonoses.2025;[Epub] CrossRef
Microscopic messengers: Extracellular vesicles shaping gastrointestinal health and disease
Zhantao Yu, Kevin A. Swift, Madeline A. Hedges, Arianne L. Theiss, Sarah F. Andres
Physiological Reports.2025;[Epub] CrossRef
Extracellular vesicles in parasitic diseases – from pathogenesis to future diagnostic tools
Saulo Almeida Menezes, Tiana Tasca
Microbes and Infection.2024; 26(4): 105310. CrossRef
An Improved Method to Enrich Large Extracellular Vesicles Derived from Giardia intestinalis through Differential Centrifugation
Abel Sana, Izadora Volpato Rossi, Bruna Sabatke, Letícia Bassani Bonato, Lia Carolina Soares Medeiros, Marcel Ivan Ramirez
Life.2023; 13(9): 1799. CrossRef
Lipidome of extracellular vesicles from Giardia lamblia
Clarissa Perez Faria, Barbara Ferreira, Ágata Lourenço, Inês Guerra, Tânia Melo, Pedro Domingues, Maria do Rosário Marques Domingues, Maria Teresa Cruz, Maria do Céu Sousa, Maria de Fátima Matos Almeida Henriques de Macedo
PLOS ONE.2023; 18(9): e0291292. CrossRef
Efficacy of extracellular vesicles as a cell-free therapy in colitis: a systematic review and meta-analysis of animal studies
Jun-Jie Hou, Wei-Wei Li, Xiao-Li Wang, A-Huo Ma, Yue-Hua Qin
Frontiers in Pharmacology.2023;[Epub] CrossRef
Protozoa-Derived Extracellular Vesicles on Intercellular Communication with Special Emphasis on Giardia lamblia
Bárbara Ferreira, Ágata Lourenço, Maria do Céu Sousa
Microorganisms.2022; 10(12): 2422. CrossRef

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Mini Review

Infection Characteristics of Clonorchis sinensis Metacercariae in Fish from Republic of Korea: Woon-Mok Sohn; Korean J Parasitol 2022;60(2):79-96.
Published online April 20, 2022; DOI: https://doi.org/10.3347/kjp.2022.60.2.79

The infection nature of Clonorchis sinensis metacercariae (CsMc) in freshwater fish hosts is closely related to the transmission of human clonorchiasis. This article reviewed the infection characteristics of CsMc in freshwater fish in the Republic of Korea (Korea). The status of CsMc infection was examined in a total of 17,792 cyprinid fish of 49 species in 9 water systems, which included Hantan-/Imjin-gang, Han-gang, Geum-gang, Mangyeong-gang, Yeongsan-gang, Tamjin-gang, Seomjin-gang, Nakdong-gang, and streams in the east coastal areas from 2010 to 2020. The infection status of CsMc was examined according to cyprinid fish species and water systems, after which analyzed by endemicity and susceptibility index. The high endemicity was shown in the cyprinid fish from 3 regions (6.1%) in the upper reaches of Nakdong-gang, such as Banbyeon-cheon (stream), Yongjeon-cheon, and Wi-cheon. The moderate levels were observed in fishes from 8 regions (16.3%), and low endemicity was shown in fishes from 20 regions (40.8%). No CsMc were detected in fish from 18 regions (36.7%). The susceptibility of CsMc in index fish, Puntungia herzi, was found to be a reliable index without examination of other fish species. CsMc infection rates were closely related to subfamily groups in the cyprinid fish hosts in a highly endemic area. In Korea, a total of 58 fish species in 10 families has been listed as the second intermediate hosts for C. sinensis. This review provides several novel features of CsMc infection and clarifies the species of second intermediate freshwater fish host in Korea.

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Clonorchis sinensis and Cholangiocarcinoma
Eun-Min Kim, Sung-Tae Hong
Journal of Korean Medical Science.2025;[Epub] CrossRef
Multiparasitism in Spain in a Korean Visiting Friends and Relatives: Case Report and Review of Imported Cases of Clonorchis sinensis in Europe
Paola Cociancic, Jacklyn Comas, J. Guillermo Esteban
Clinical Case Reports.2025;[Epub] CrossRef
Clonorchiasis and opisthorchiasis: epidemiology, transmission, clinical features, morbidity, diagnosis, treatment, and control
Men-Bao Qian, Jennifer Keiser, Jürg Utzinger, Xiao-Nong Zhou, Graeme N. Forrest
Clinical Microbiology Reviews.2024;[Epub] CrossRef
Infection characteristics of Metagonimus species (Digenea: Heterophyidae) metacercariae in fish from major rivers of Korea
Woon-Mok Sohn
Parasites, Hosts and Diseases.2024; 62(1): 1. CrossRef
Current status of Clonorchis sinensis and clonorchiasis in Korea: epidemiological perspectives integrating the data from human and intermediate hosts
Won Gi Yoo, Woon-Mok Sohn, Byoung-Kuk Na
Parasitology.2022; 149(10): 1296. CrossRef

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Brief Communications

Prevalence and Intensity of Opisthorchis viverrini Metacercarial Infection in Fish from Phnom Penh, Takeo, and Kandal Provinces, Cambodia: Woon-Mok Sohn, Seung-Ho Choi, Bong-Kwang Jung, Sooji Hong, Seungwan Ryoo, Taehee Chang, Keon Hoon Lee, Byoung-Kuk Na, Sung-Jong Hong, Virak Khieu, Jong-Yil Chai; Korean J Parasitol 2021;59(5):531-536.
Published online October 22, 2021; DOI: https://doi.org/10.3347/kjp.2021.59.5.531

Abstract
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The prevalence and intensity of Opisthorchis viverrini metacercariae (OvMc) were investigated in fish from 3 southern administrative regions along the Mekong River in Cambodia, i.e., Phnom Penh, Takeo, and Kandal Provinces from 2017 to 2020. A total of 295 freshwater fish (24 species) were transported to our laboratory with ice and examined using the artificial digestion method. In Phnom Penh, among 4 fish species positive for OvMc, 9 (23.7%) of 38 specimens examined were infected, and their intensity of infection averaged 4.3 metacercariae per infected fish. In Takeo Province, among 10 fish species positive for OvMc, 24 (38.1%) out of 63 fish examined were infected, and their intensity of infection was av. 14.4 metacercariae per infected fish. In particular, all of 3 Osteochilus schlegelii fish examined were infected, and their infection intensity was high, 34.7 metacercariae per fish. In Kandal Province, among 6 fish species positive for OvMc, 46 (90.2%) out of 51 specimens examined were infected, and their infection intensity was 24.0 metacercaraie per infected fish. All fish of Systomus orphoides (n=17), Barbonymus altus (n=14), and Rasbora aurotaenia (n=2) were infected, and their intensity of infection averaged 37.7, 21.6, and 18.5 metacercariae per fish, respectively. Metacercariae of Haplochis yokogawai, Haplorchis taichui, and Centrocestus formosanus were detected in fish from Takeo and Kandal Provinces. From these results, it has been confirmed that a variety of fish species from Phnom Penh, Takeo, and Kandal Provinces are commonly infected with OvMc, and preventive measures to avoid human O. viverrini infection should be performed in Cambodia.

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Biological Hazards and Indicators Found in Products of Animal Origin in Cambodia from 2000 to 2022: A Systematic Review
Shwe Phue San, Rortana Chea, Delia Grace, Kristina Roesel, Sothyra Tum, Stephen Young, Tumnoon Charaslertrangsi, Nazanin Zand, Shetty Seetharama Thombathu, Ra Thorng, Leab Kong, Kuok Fidero, Linda Nicolaides
International Journal of Environmental Research and Public Health.2024; 21(12): 1621. CrossRef
Re‐evaluation of certain aspects of the EFSA Scientific Opinion of April 2010 on risk assessment of parasites in fishery products, based on new scientific data. Part 2
Ana Allende, Avelino Alvarez‐Ordóñez, Valeria Bortolaia, Sara Bover‐Cid, Alessandra De Cesare, Wietske Dohmen, Laurent Guillier, Lieve Herman, Liesbeth Jacxsens, Maarten Nauta, Lapo Mughini‐Gras, Jakob Ottoson, Luisa Peixe, Fernando Perez‐Rodriguez, Panag
EFSA Journal.2024;[Epub] CrossRef

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Endemicity of Zoonotic Trematode Metacercariae in Fish from Deokcheon-gang (River) in Sancheong-gun, Gyeongsangnam-do, Republic of Korea: Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Hee Il Lee, Jung-Won Ju, Myoung-Ro Lee, Jeong-Gil Park, Jihee Ahn; Korean J Parasitol 2021;59(5):523-529.
Published online October 22, 2021; DOI: https://doi.org/10.3347/kjp.2021.59.5.523

The endemicity of zoonotic trematode metacercariae (ZTM) was investigated with total 871 freshwater fishes (19 species) from Deokcheon-gang (a branch stream of Gyeongho-gang) in Sancheong-gun, Gyeongsangnam-do, Korea for 3 years (2018-2020). All fishes were examined with the artificial digestion method. The metacercariae of Clonorchis sinensis (CsMc) were detected in 233 (36.3%) out of 642 fish in 11 positive fish species (PFS), and their infection intensity was 27 per fish infected (PFI). Especially, in index fish, Puntungia herzi, of CsMc infection, prevalence was 64.2% and infection intensity was 37 PFI. Metagonimus spp. metacercariae (MsMc) were found in 760 (87.5%) out of 869 fish in 18 PFS and their infection intensity was 228 PFI. In sweet smelt, Plecoglossus altivelis, the prevalence of MsMc was 97.6% and their infection intensity was 3,570 PFI. Centrocestus armatus metacercariae were detected in 209 (29.4%) out of 710 fish in 8 PFS and their infection intensity was 1,361 PFI. Echinostoma spp. metacercariae were found in 293 (42.6%) out of 688 fish in 15 PFS and their infection intensity was 5 PFI. Metacercariae of Clinostomum complanatum and Metorchis orientalis were also detected in 2.7% and 21.2% fish in 4 PFS and their infection intensities were 3.1 and 3.4 PFI respectively. By the present study, it was confirmed that some species of ZTM including CsMc and MsMc are more or less prevalent in fishes from Deokcheon-gang in Sancheong-gun, Gyeongsangnam-do, Korea.

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Infection characteristics of Metagonimus species (Digenea: Heterophyidae) metacercariae in fish from major rivers of Korea
Woon-Mok Sohn
Parasites, Hosts and Diseases.2024; 62(1): 1. CrossRef
Re‐evaluation of certain aspects of the EFSA Scientific Opinion of April 2010 on risk assessment of parasites in fishery products, based on new scientific data. Part 2
Ana Allende, Avelino Alvarez‐Ordóñez, Valeria Bortolaia, Sara Bover‐Cid, Alessandra De Cesare, Wietske Dohmen, Laurent Guillier, Lieve Herman, Liesbeth Jacxsens, Maarten Nauta, Lapo Mughini‐Gras, Jakob Ottoson, Luisa Peixe, Fernando Perez‐Rodriguez, Panag
EFSA Journal.2024;[Epub] CrossRef
Infection Characteristics of Clonorchis sinensis Metacercariae in Fish from Republic of Korea
Woon-Mok Sohn
The Korean Journal of Parasitology.2022; 60(2): 79. CrossRef
Current status of Clonorchis sinensis and clonorchiasis in Korea: epidemiological perspectives integrating the data from human and intermediate hosts
Won Gi Yoo, Woon-Mok Sohn, Byoung-Kuk Na
Parasitology.2022; 149(10): 1296. CrossRef

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Survey of Zoonotic Trematode Metacercariae in Fish from Irrigation Canal of Togyo-jeosuji (Reservoir) in Cheorwon-gun, Gangwon-do, Republic of Korea: Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Hee Il Lee, Jung-Won Ju, Myoung-Ro Lee, Eun-Joo Lim, Sung Yong Son, Eunmi Ko, Jaeseok Choi; Korean J Parasitol 2021;59(4):427-432.
Published online August 18, 2021; DOI: https://doi.org/10.3347/kjp.2021.59.4.427

The infection status of zoonotic trematode metacercariae (ZTM) was investigated in total 568 freshwater fishes (19 species) from the irrigation canal of Togyo-jeosuji (Reservoir) in Cheorwon-gun, Gangwon-do, the Republic of Korea for 3 years (2018-2020). All fishes were examined using the artificial digestion method. The metacercariae of Clonorchis sinensis (CsMc) were detected in 180 (43.8%) out of 411 fish of positive species, and their infection intensity was 38 per fish infected (PFI). Especially, in 2 fish species, i.e., Pseudorasbora parva and Puntungia herzi, the prevalence was 82.1% and 31.3%, and the infection intensity with CsMc was 88 and 290 PFI, respectively. Metagonimus spp. metacercariae (MsMc) were found in 403 (74.1%) out of 544 fish of positive species, and their infection intensity was 62 PFI. In the pale chub, Zacco platypus, the prevalence of MsMc was 98.6%, and their infection intensity was 144 PFI. Centrocestus armatus metacercariae were detected in 171 (38.9%) out of 440 fish of positive species, and their infection intensity was 1,844 PFI. Echinostoma spp. metacercariae were found in 94 (19.6%) out of 479 fish of positive species, and their infection intensity was 3 PFI. Metorchis orientalis metacercariae were detected in 43 (29.3%) out of 147 fish of positive species, and their infection intensity was 4 PFI. By the present study, it has been confirmed that some species of ZTM, including CsMc and MsMc, are prevalent in fishes from the irrigation canal of Togyo-jeosuji in Cheorwon-gun, Gangwon-do, Korea.

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Re‐evaluation of certain aspects of the EFSA Scientific Opinion of April 2010 on risk assessment of parasites in fishery products, based on new scientific data. Part 2
Ana Allende, Avelino Alvarez‐Ordóñez, Valeria Bortolaia, Sara Bover‐Cid, Alessandra De Cesare, Wietske Dohmen, Laurent Guillier, Lieve Herman, Liesbeth Jacxsens, Maarten Nauta, Lapo Mughini‐Gras, Jakob Ottoson, Luisa Peixe, Fernando Perez‐Rodriguez, Panag
EFSA Journal.2024;[Epub] CrossRef
Current status of Clonorchis sinensis and clonorchiasis in Korea: epidemiological perspectives integrating the data from human and intermediate hosts
Won Gi Yoo, Woon-Mok Sohn, Byoung-Kuk Na
Parasitology.2022; 149(10): 1296. CrossRef
Integrative Transcriptomics and Proteomics Analyses to Reveal the Developmental Regulation of Metorchis orientalis: A Neglected Trematode With Potential Carcinogenic Implications
Jun-Feng Gao, Qing-Bo Lv, Rui-Feng Mao, Yun-Yi Sun, Ying-Yu Chen, Yang-Yuan Qiu, Qiao-Cheng Chang, Chun-Ren Wang
Frontiers in Cellular and Infection Microbiology.2021;[Epub] CrossRef

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Original Article

Prevalence and Infection Intensity of Zoonotic Trematode Metacercariae in Fish from Soyang-cheon (Stream), in Wanju-gun, Jeollabuk-do, Korea: Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Jung-Won Ju, Cheon-Hyeon Kim, Min-Ah Hwang, Kyeong-Woo No, Jong-Ho Park; Korean J Parasitol 2021;59(3):265-271.
Published online June 21, 2021; DOI: https://doi.org/10.3347/kjp.2021.59.3.265

We surveyed on the infection status of zoonotic trematode metacercariae (ZTM) in freshwater fishes from Soyang-cheon (a branch stream of Mangyeong-gang) in Wanju-gun, Jeollabuk-do, the Republic of Korea. A total of 927 fishes were individually examined with the artificial digestion method during 2013-2015 (462 fish in 15 spp.) and 2018-2019 (465 fish in 25 spp.). Clonorchis sinensis metacercariae were detected in 207 (31.4%) out of 659 fishes in 14 positive fish species (PFS), and their mean intensity was 114 per fish infected (PFI). Metagonimus spp. metacercariae were found in 302 (37.4%) out of 808 fishes in 21 PFS, and their mean intensity was 12 PFI. Centrocestus armatus metacercariae were detected in 222 (59.0%) out of 376 fishes in 12 PFS, and their mean intensity was 383 PFI. Echinostoma spp. metacercariae were found in 139 (22.1%) out of 628 fishes in 10 PFS, and their mean intensity was 7 PFI. Clinostomum complanatum metacercariae were detected in 14 (6.5%) out of 214 fishes in 4 PFS, and their mean intensity was 2.4 PFI. Metorchis orientalis metacercariae were detected in 36 (13.5%) out of 267 fishes in 5 PFS, and their mean intensity was 4.3 PFI. Conclusively, the prevalence and infection intensity of ZTM is generally not so high in fishes from Soyang-cheon. However, those of C. sinensis metacercariae are more or less higher in 2 fish species, Pungtungia herzi and Sarcocheilichthys variegatus wakiyae.

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Advanced genomic research in understanding fish-borne zoonotic parasitic infection
Sk Injamamul Islam, Piyanan Taweethavonsawat
Microbial Pathogenesis.2025; 200: 107367. CrossRef
Infection characteristics of Metagonimus species (Digenea: Heterophyidae) metacercariae in fish from major rivers of Korea
Woon-Mok Sohn
Parasites, Hosts and Diseases.2024; 62(1): 1. CrossRef
Prevalence and species identification of trematode metacercariae in Qiqihar, Northeast China
Fengyu Zhang, Jianke Li, Shaocheng Zhang, Ting Chen, Hao Zhang
Frontiers in Microbiology.2024;[Epub] CrossRef
Re‐evaluation of certain aspects of the EFSA Scientific Opinion of April 2010 on risk assessment of parasites in fishery products, based on new scientific data. Part 2
Ana Allende, Avelino Alvarez‐Ordóñez, Valeria Bortolaia, Sara Bover‐Cid, Alessandra De Cesare, Wietske Dohmen, Laurent Guillier, Lieve Herman, Liesbeth Jacxsens, Maarten Nauta, Lapo Mughini‐Gras, Jakob Ottoson, Luisa Peixe, Fernando Perez‐Rodriguez, Panag
EFSA Journal.2024;[Epub] CrossRef
Infection Characteristics of Clonorchis sinensis Metacercariae in Fish from Republic of Korea
Woon-Mok Sohn
The Korean Journal of Parasitology.2022; 60(2): 79. CrossRef
Zoonotic diseases of fish and their prevention and control
Mina Ziarati, Mohammad Jalil Zorriehzahra, Fatemeh Hassantabar, Zibandeh Mehrabi, Manish Dhawan, Khan Sharun, Talha Bin Emran, Kuldeep Dhama, Wanpen Chaicumpa, Shokoofeh Shamsi
Veterinary Quarterly.2022; 42(1): 95. CrossRef
Current status of Clonorchis sinensis and clonorchiasis in Korea: epidemiological perspectives integrating the data from human and intermediate hosts
Won Gi Yoo, Woon-Mok Sohn, Byoung-Kuk Na
Parasitology.2022; 149(10): 1296. CrossRef
Survey of Zoonotic Trematode Metacercariae in Fish from Irrigation Canal of Togyo-jeosuji (Reservoir) in Cheorwon-gun, Gangwon-do, Republic of Korea
Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Hee Il Lee, Jung-Won Ju, Myoung-Ro Lee, Eun-Joo Lim, Sung Yong Son, Eunmi Ko, Jaeseok Choi
The Korean Journal of Parasitology.2021; 59(4): 427. CrossRef

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Brief Communications

High Endemicity with Clonorchis sinensis Metacercariae in Fish from Yongjeon-cheon (Stream) in Cheongsong-gun, Gyeongsangbuk-do, Korea: Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Hee Il Lee, Myoung-Ro Lee, Jung-Won Ju, Gou Ok Kim; Korean J Parasitol 2021;59(1):97-101.
Published online February 19, 2021; DOI: https://doi.org/10.3347/kjp.2021.59.1.97

Abstract
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The infection status with Clonorchis sinensis metacercariae (CsMc) was examined in freshwater fishes from Yongjeon-cheon (a branch of Nakdong-gang) located in Cheongsong-gun, Gyeongsangbuk-do, the Republic of Korea (Korea). A total of 750 fishes in 19 species were examined by the artificial digestion method for 2 years (2019 and 2020). CsMc were detected in 378 (51.4%) out of 735 fishes in 14 species (73.7%), and the infection intensity was 666 per fish infected. In 2019, CsMc were found in 172 (68.0%) out of 253 fishes in 10 species, and the infection intensity was 565 per fish infected. In 2020, CsMc were detected in 206 (62.2%) out of 331 fishes in 10 species, and the infection intensity was 751 per fish infected. The other zoonotic trematode, ie. Metagonimus spp., Centrocestus armatus, Echinostoma spp. and Clinostomum complanatum, metacercariae were also detected in fishes from the survey streams, but their endemicities were relatively low. Conclusively, it was first confirmed that CsMc are highly endemic in fishes from Yongjeon-cheon in Cheongsong-gun, Gyeongsangbuk-do, Korea.

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Parvatrema duboisi (Digenea: Gymnophallidae) Life Cycle Stages in Manila Clams, Ruditapes philippinarum, from Aphae-do (Island), Shinan-gun, Korea: Bong-Kwang Jung, Taehee Chang, Hyejoo Shin, Seungwan Ryoo, Sooji Hong, Jeonggyu Lee, Hyemi Song, Jaeeun Cho, Deok-Gyu Kim, Hojong Jun, Min-Jae Kim, Eun Jeong Won, Eun-Taek Han, Eun-Hee Shin, Jong-Yil Chai; Korean J Parasitol 2021;59(1):83-88.
Published online February 19, 2021; DOI: https://doi.org/10.3347/kjp.2021.59.1.83

Abstract
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Life cycle stages, including daughter sporocysts, cercariae, and metacercariae, of Parvatrema duboisi (Dollfus, 1923) Bartoli, 1974 (Digenea: Gymnophallidae) have been found in the Manila clam Ruditapes philippinarum from Aphaedo (Island), Shinan-gun, Jeollanam-do, Korea. The daughter sporocysts were elongated sac-like and 307-570 (av. 395) μm long and 101-213 (av. 157) μm wide. Most of the daughter sporocysts contained 15-20 furcocercous cercariae each. The cercariae measured 112-146 (av. 134) μm in total length and 35-46 (av. 40) μm in width, with 69-92 (av. 85) μm long body and 39-54 (av. 49) μm long tail. The metacercariae were 210-250 (av. 231) μm in length and 170-195 (av. 185) μm in width, and characterized by having a large oral sucker, genital pore some distance anterior to the ventral sucker, no ventral pit, and 1 compact or slightly lobed vitellarium, strongly suggesting P. duboisi. The metacercariae were experimentally infected to ICR mice, and adults were recovered at day 7 post-infection. The adult flukes were morphologically similar to the metacercariae except in the presence of up to 20 eggs in the uterus. The daughter sporocysts and metacercariae were molecularly (ITS1-5.8S rDNA-ITS2) analyzed to confirm the species, and the results showed 99.8-99.9% identity with P. duboisi reported from Kyushu, Japan and Gochang, Korea. These results confirmed the presence of various life cycle stages of P. duboisi in the Manila clam, R. philippinarum, playing the role of the first as well as the second intermediate host, on Aphae-do (Island), Shinan-gun, Korea.

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Original Articles

Echinostoma mekongi: Discovery of Its Metacercarial Stage in Snails, Filopaludina martensi cambodjensis, in Pursat Province, Cambodia: Jong-Yil Chai, Woon-Mok Sohn, Jaeeun Cho, Bong-Kwang Jung, Taehee Chang, Keon Hoon Lee, Virak Khieu, Rekol Huy; Korean J Parasitol 2021;59(1):47-53.
Published online February 19, 2021; DOI: https://doi.org/10.3347/kjp.2021.59.1.47

Abstract
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Echinostoma mekongi was reported as a new species in 2020 based on specimens collected from humans in Kratie and Takeo Province, Cambodia. In the present study, its metacercarial stage has been discovered in Filopaludina martensi cambodjensis snails purchased from a local market nearby the Tonle Sap Lake, Pursat Province, Cambodia. The metacercariae were fed orally to an experimental hamster, and adult flukes were recovered at day 20 post-infection. They were morphologically examined using light and scanning electron microscopes and molecularly analyzed by sequencing of their mitochondrial cox1 and nad1 genes. A total of 115 metacercariae (1-8 per snail) were detected in 60 (60.0%) out of 100 Filopaludina snails examined. The metacercariae were round, 174 ?m in average diameter (163-190 ?m in range), having a thin cyst wall, a head collar armed with 37 collar spines, and characteristic excretory granules. The adult flukes were elongated, ventrally curved, 7.3 (6.4-8.2)×1.4 (1.1-1.7) mm in size, and equipped with 37 collar spines on the head collar (dorsal spines in 2 alternating rows), being consistent with E. mekongi. In phylogenetic analyses, the adult flukes showed 99.0-100% homology based on cox1 sequences and 98.9-99.7% homology based on nad1 sequences with E. mekongi. The results evidenced that F. martensi cambodjensis snails act as the second intermediate host of E. mekongi, and hamsters can be used as a suitable experimental definitive host. As local people favor to eat undercooked snails, these snails seem to be an important source of human infection with E. mekongi in Cambodia.

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Bong-Kwang Jung, Taehee Chang, Seungwan Ryoo, Sooji Hong, Jeonggyu Lee, Sung-Jong Hong, Woon-Mok Sohn, Virak Khieu, Rekol Huy, Jong-Yil Chai
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Parasitology.2022; 149(7): 913. CrossRef
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Parasitology.2022; 149(10): 1262. CrossRef

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Survey of Zoonotic Trematode Metacercariae in Fish from Water Systems of Geum-gang (River) in Republic of Korea: Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Cheon-Hyeon Kim, Min-Ah Hwang, Kyeong-Woo No, Jai-Dong Kim; Korean J Parasitol 2021;59(1):23-33.
Published online February 19, 2021; DOI: https://doi.org/10.3347/kjp.2021.59.1.23

Abstract
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The infection status of zoonotic trematode metacercariae (ZTM) was surveyed in freshwater fishes from the water systems of Geum-gang (River) in the Republic of Korea (Korea). A total of 1,161 freshwater fishes from 6 local sites of Geum-gang were examined with the artificial digestion method for 4 years (2012-2015). Clonorchis sinensis metacercariae were detected in 122 (37.2%) out of 328 fishes in the positive fish species from 4 surveyed areas, and their mean intensity was 43 per fish infected. Metagonimus spp. metacercariae were found in 432 (51.7%) out of 835 fishes in the positive fish species from all 6 surveyed areas, and their mean intensity was 30 per fish infected. Centrocestus armatus metacercariae were detected in 285 (75.0%) out of 380 fishes in the positive fish species from 6 surveyed areas, and their mean intensity was 2,100 per fish infected. Echinostoma spp. metacercariae were found in 56 (19.7%) out of 284 fishes in the positive fish species from 5 surveyed areas, and their mean intensity was 10 per fish infected. Clinostomum complanatum metacercariae were detected in 98 (57.3%) out of 171 fishes in the positive fish species from only 2 surveyed areas, and their mean intensity was 11 per fish infected. Conclusively, the endemicity of ZTM is not so high in fishes from water systems of Geum-gang in Korea although it is more or less different by fish species, surveyed areas and ZTM species.

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Woon-Mok Sohn
Parasites, Hosts and Diseases.2024; 62(1): 1. CrossRef
Infection Characteristics of Clonorchis sinensis Metacercariae in Fish from Republic of Korea
Woon-Mok Sohn
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Current status of Clonorchis sinensis and clonorchiasis in Korea: epidemiological perspectives integrating the data from human and intermediate hosts
Won Gi Yoo, Woon-Mok Sohn, Byoung-Kuk Na
Parasitology.2022; 149(10): 1296. CrossRef
Prevalence and Infection Intensity of Zoonotic Trematode Metacercariae in Fish from Soyang-cheon (Stream), in Wanju-gun, Jeollabuk-do, Korea
Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Jung-Won Ju, Cheon-Hyeon Kim, Min-Ah Hwang, Kyeong-Woo No, Jong-Ho Park
The Korean Journal of Parasitology.2021; 59(3): 265. CrossRef
Survey of Zoonotic Trematode Metacercariae in Fish from Irrigation Canal of Togyo-jeosuji (Reservoir) in Cheorwon-gun, Gangwon-do, Republic of Korea
Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Hee Il Lee, Jung-Won Ju, Myoung-Ro Lee, Eun-Joo Lim, Sung Yong Son, Eunmi Ko, Jaeseok Choi
The Korean Journal of Parasitology.2021; 59(4): 427. CrossRef

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Morphological and Molecular Characteristics of Clinostomid Metacercariae from Korea and Myanmar: Eun Jeong Won, Yu Jeong Lee, Moon-Ju Kim, Jong-Yil Chai, Byoung-Kuk Na, Woon-Mok Sohn; Korean J Parasitol 2020;58(6):635-645.
Published online December 29, 2020; DOI: https://doi.org/10.3347/kjp.2020.58.6.635

Abstract
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Morphological and molecular characterization of clinostomid metacercariae (CMc) was performed with the specimens collected in fish from Korea and Myanmar. Total 6 batches of clinostomid specimens by the fish species and geographical localities, 5 Korean and 1 Myanmar isolates, were analyzed with morphological (light microscopy and SEM) and molecular methods (the cytochrome c oxidase 1 gene and internal transcribed spacer 1/5.8S rRNA sequence). There were some morphological variations among CMc specimens from Korea. However, some morphometrics, i.e., the size of worm body and each organ, ratio of body length to body width, and morphology of cecal lumens, were considerably different between the specimens from Korea and Myanmar. The surface ultrastructures were somewhat different between the specimens from Korea and Myanmar. The CO1 sequences of 5 Korean specimens ranging 728-736 bp showed 99.6-100% identity with Clinostomum complanatum (GenBank no. KM923964). They also showed 99.9-100% identity with C. complanatum (FJ609420) in the ITS1 sequences ranging 692-698 bp. Meanwhile, the ITS1 sequences of Myanmar specimen showed 99.9% identity with Euclinostomum heterostomum (KY312847). Five sequences from Korean specimens clustered with the C. complanatum genes, but not clustered with Myanmar specimens. Conclusively, it was confirmed that CMc from Korea were morphologically and molecularly identical with C. complanatum and those from Myanmar were E. heterostomum.

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Brief Communication

High Prevalence of Clonorchis sinensis and Other Zoonotic Trematode Metacercariae in Fish from a Local Market in Yen Bai Province, Northern Vietnam: Fuhong Dai, Sung-Jong Hong, Jhang Ho Pak, Thanh Hoa Le, Seung-Ho Choi, Byoung-Kuk Na, Woon-Mok Sohn; Korean J Parasitol 2020;58(3):333-338.
Published online June 26, 2020; DOI: https://doi.org/10.3347/kjp.2020.58.3.333

Abstract
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A small survey was performed to investigate the recent infection status of Clonorchis sinensis and other zoonotic trematode metacercariae in freshwater fish from a local market of Yen Bai city, Yen Bai province, northern Vietnam. A total of 118 fish in 7 species were examined by the artificial digestion method on March 2016. The metacercariae of 4 species of zoonotic trematodes, i.e., C. sinensis, Haplorchis pumilio, Haplorchis taichui, and Centrocestus formosanus, were detected. The metacercariae of C. sinensis were found in 62 (69.7%) out of 89 fish (5 species), and their intensity of infection was very high, 81.2 per fish infected. Prevalences of 3 intestinal flukes, H. pumilio, H. taichui and C. formosanus, were 75.0%, 47.6%, and 31.7% in positive fish species, respectively, with the metacercarial intensities of 15.5, 10.3, and 2.2 per fish infected. From the above results, it has been confirmed that various species of freshwater fish continue to play the role of the infection source of C. sinensis and other zoonotic trematodes in Yen Bai city, Yen Bai province, northern Vietnam. It is of particular note that the prevalence and intensity of C. sinensis metacercariae are much higher than those reported in previous studies in fish in northern Vietnam.

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Original Articles

4-Hydroxybenzaldehyde Restricts the Intracellular Growth of Toxoplasma gondii by Inducing SIRT1-Mediated Autophagy in Macrophages: Jina lee, Jae-Won Choi, Hye Young Han, Woo Sik Kim, Ha-Yeon Song, Eui-Baek Byun, Eui-Hong Byun, Young-Ha Lee, Jae-Min Yuk; Korean J Parasitol 2020;58(1):7-14.
Published online February 29, 2020; DOI: https://doi.org/10.3347/kjp.2020.58.1.7

Abstract
PDF

Toxoplasma gondii is an intracellular protozoan parasite that infects approximately one third of the human popu- lation worldwide. Considering the toxicity and side effects of anti-toxoplasma medications, it is important to develop effec- tive drug alternatives with fewer and less severe off-target effects. In this study, we found that 4-hydroxybenzaldehyde (4- HBA) induced autophagy and the expression of NAD-dependent protein deacetylase sirtuin-1 (SIRT1) in primary murine bone marrow-derived macrophages (BMDMs). Interestingly, treatment of BMDMs with 4-HBA significantly reduced the number of macrophages infected with T. gondii and the proliferation of T. gondii in infected cells. This effect was impaired by pretreating the macrophages with 3-methyladenine or wortmannin (selective autophagy inhibitors) or with sirtinol or EX527 (SIRT1 inhibitors). Moreover, we found that pharmacological inhibition of SIRT1 prevented 4-HBA-mediated expres- sion of LC3-phosphatidylethanolamine conjugate (LC3-II) and the colocalization of T. gondii parasitophorous vacuoles with autophagosomes in BMDMs. These data suggest that 4-HBA promotes antiparasitic host responses by activating SIRT1- mediated autophagy, and 4-HBA might be a promising therapeutic alternative for the treatment of toxoplasmosis.

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Infections of Digenetic Trematode Metacercariae in Wrestling Halfbeak, Dermogenys pusilla from Bangkok Metropolitan Region in Thailand: Laddawan Patarwut, Thapana Chontananarth, Jong-Yil Chai, Watchariya Purivirojkul; Korean J Parasitol 2020;58(1):27-35.
Published online February 29, 2020; DOI: https://doi.org/10.3347/kjp.2020.58.1.27

Abstract
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This study aimed to investigate metacercarial infections in the wrestling halfbeak, Dermogenys pusilla, collected from Bangkok metropolitan region of Thailand. A total of 4,501 fish from 78 study sites were commonly examined with muscle compression and digestion methods (only head part of fish) during September 2017 to July 2018. The overall prevalence of metacercarial infection was 86.1% (3,876/4,501 individuals), and the mean intensity was 48.9 metacercariae per fish infected. Four species, i.e., Posthodiplostomum sp., Stellantchasmus falcatus, Cyathocotylidae fam. sp., and Centrocestus formosanus, of digenetic trematode metacercariae (DTM) were detected. The prevalences were 65.8%, 52.0%, 2.1%, and 1.2%, respectively and their mean intensities were 23.1, 51.6, 1.4, and 3.2 per fish infected, respectively. The seasonal prevalences were 81.0% in winter, 87.8% in summer and 87.4% in rainy, and the mean intensities were 38.9, 46.6, and 55.2 metacercariae per fish infected, respectively. Conclusively, it was confirmed that the wrestling halfbeak play the role of second intermediate hosts of 4 species of digenetic trematodes including S. falcatus and Posthodiplostomum sp. in Bangkok metropolitan region. And then the metacercariae of C. formosanus and Cyathocotylidae fam. sp. are to be first found in the wrestling halfbeak by this study.

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Loop‐Mediated Isothermal Amplification Combined With Lateral‐Flow Dipstick for Detection of Centrocestus formosanus in Ornamental Fish
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Alterations in histopathology and stress-associated gene expression induced by infection with Prohemistomum vivax encysted metacercariae in Nile tilapia
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Feng Jiang, Wanyu Zhang, Yang Pan, Xudong Yu, Jiacheng Cao, Ningning Du, Mengyi Zhu, Shengli Gu, Xiaodong Zhan
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High diversity of trematode metacercariae that parasitize freshwater gastropods in Bangkok, Thailand, and their infective situations, morphologies and phylogenetic relationships
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Seroprevalence of Sarcocystis falcatula in Two Islands of Malaysia using Recombinant Surface Antigen 4: Tengku-Idris Tengku Idzzan Nadzirah, Fong Mun Yik, Lau Yee Ling; Korean J Parasitol 2020;58(1):1-5.
Published online February 29, 2020; DOI: https://doi.org/10.3347/kjp.2020.58.1.1

Sarcocystosis was diagnosed worldwide by serodiagnostic tests utilising the whole parasite, for which the protozoa were maintained in vitro are more costly. In this study, antigenicity of Sarcocystis falcatula recombinant protein (rSfSAG4) was investigated towards the local communities of Pangkor and Tioman Islands and its seroprevalence was surveyed in these islands. A total of 348 human sera were tested using rSfSAG4 by Western blot and ELISA. High prevalence of sarcocystosis was observed in Tioman Island (80.6%) than in Pangkor Island (50.0%) by Western blot. In ELISA, the seroprevalence observed in Tioman Island was 45.9%, whereas in Pangkor Island 63.0%. In other parasitic infections, the prevalence was 34.0% by Western blot and 46.0% by ELISA. In healthy control group, 7% by Western blot and 8% by ELISA showed positivity to rSfSAG4. It is suggested SfSAG4 is a candidate antigen to measure seroprevalence of sarcocystosis.

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Sarcocystis infection in domestic and wild avian hosts: Inseparable flight partners
Petras Prakas, Rafael Calero-Bernal, Jitender P. Dubey
Veterinary Parasitology.2025; 335: 110413. CrossRef

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1 Web of Science
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Brief Communication

Survey of Gymnophalloides seoi Metacercariae in Natural and Cultured Oysters from Several Western Coastal Areas, Korea: Taehee Chang, Bong-Kwang Jung, Hyemi Song, Jaeeun Cho, Sooji Hong, Keon-Hoon Lee, Eui-Hyug Hoang, Jisu Kang, Jini Lim, Hana Lee, Jong-Yil Chai; Korean J Parasitol 2019;57(6):705-708.
Published online December 31, 2019; DOI: https://doi.org/10.3347/kjp.2019.57.6.705

Abstract
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Gymnophalloides seoi (Digenea: Gymnophallidae) is a human intestinal trematode contracted by eating raw oysters (Crassostrea gigas) in the Republic of Korea (=Korea). It has been known to be highly endemic in Aphae Island, Shinan-gun, Jeollanam-do (Province). However, recent epidemiological status of G. seoi has not been reported since the 1990s. In this study, we investigated the prevalence of G. seoi metacercariae in natural and cultured oysters collected from 3 islands and 2 coastal areas in western parts of Korea. The oysters were examined using the artificial digestion method followed by stereomicroscopy. The overall positive rate of G. seoi metacercariae in natural oysters was 66.0% (99/150), and the oysters collected from Yubu Island showed the highest infection rate (74.0%). However, the metacercarial density per oyster was relatively low (1.5-2.4 per oyster). By contrast, no metacercaria was found in cultured oysters purchased from 2 coastal areas in Chungcheongnam-do. Thus, we could confirm that natural oysters produced from 3 western coastal islands are infected with G. seoi metacercariae, whereas cultured oysters purchased from 2 coastal areas were free from infection.

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High sensitivity detection of Clonorchis sinensis and Gymnophalloides seoi in food by new real-time gene amplification method
Min Ji Hong, Mi-Gyeong Kim, Doo Won Seo, Hyun Mi Jung, Hyun-Ja Han, Seung Hwan Kim, Insun Joo
Food Science and Biotechnology.2025; 34(14): 3417. CrossRef

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Original Articles

Infection Status with Digenetic Trematode Metacercariae in Fishes from Coastal Lakes in Gangwon-do, Republic of Korea: Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Soon-Won Lee; Korean J Parasitol 2019;57(6):681-690.
Published online December 31, 2019; DOI: https://doi.org/10.3347/kjp.2019.57.6.681

Abstract
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The infection status of digenetic trematode metacercariae (DTM) was investigated in fishes from coastal lakes in Gangwon-do, the Republic of Korea (Korea). All fishes collected in 5 lakes were examined with the artificial digestion method. More than 10 species, i.e., Metagonimus spp., Pygidiopsis summa, Centrocestus armatus, Metorchis orientalis, M. taiwanensis, Clinostomum complanatum, Echinostoma spp., Stictodora spp., Diplostomum sp. and Diplostomid No. 1. by Morita (1960), of DTM were detected in fishes from 5 coastal lakes in Gangwon-do. Metagonimus spp. metacercariae were found in 52 (41.3%) out of 126 sea rundace, Tribolodon hakonensis, from 5 lakes, and their density was 14.6 per fish infected. P. summa metacercariae were detected in 48 (84.2%) out of 57 mullets from 5 lakes, and their density was 316 per fish infected. C. armatus metacercariae were detected in 7 (14.6%) T. hakonensis and 3 (15.0%) Tridentiger brevispinis from Hyang-ho, and 5 (19.2%) Acanthogobius flavimanus from Gyeongpo-ho. Stictodora spp. metacercariae were found in 4 fish species, i.e., Tridentiger obscurus, Tridentiger trigonocephalus, Chelon haematocheilus, and Acanthogobius lactipes, from Gyeongpo-ho. Total 15 C. complanatum metacercariae were detected in 2 (9.1%) crucian carp, Carassius auratus, from Songji-ho. M. taiwanensis metacercariae were found in T. hakonensis from Hyang-ho and Gyeongpo-ho and in Pseudorasbora parva from Gyeongpo-ho. Total 11 M. orientalis metacercariae were detected in 3 (6.3%) T. hakonensis from Hyang-ho. From the above results, it was confirmed that various species of DTM are infected in fishes from coastal lakes in Gangwon-do, Korea.

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Infection characteristics of Metagonimus species (Digenea: Heterophyidae) metacercariae in fish from major rivers of Korea
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Re‐evaluation of certain aspects of the EFSA Scientific Opinion of April 2010 on risk assessment of parasites in fishery products, based on new scientific data. Part 2
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Survey of Zoonotic Trematode Metacercariae in Fish from Water Systems of Geum-gang (River) in Republic of Korea
Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Cheon-Hyeon Kim, Min-Ah Hwang, Kyeong-Woo No, Jai-Dong Kim
The Korean Journal of Parasitology.2021; 59(1): 23. CrossRef
Prevalence and Infection Intensity of Zoonotic Trematode Metacercariae in Fish from Soyang-cheon (Stream), in Wanju-gun, Jeollabuk-do, Korea
Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Jung-Won Ju, Cheon-Hyeon Kim, Min-Ah Hwang, Kyeong-Woo No, Jong-Ho Park
The Korean Journal of Parasitology.2021; 59(3): 265. CrossRef
Survey of Zoonotic Trematode Metacercariae in Fish from Irrigation Canal of Togyo-jeosuji (Reservoir) in Cheorwon-gun, Gangwon-do, Republic of Korea
Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Hee Il Lee, Jung-Won Ju, Myoung-Ro Lee, Eun-Joo Lim, Sung Yong Son, Eunmi Ko, Jaeseok Choi
The Korean Journal of Parasitology.2021; 59(4): 427. CrossRef
Endemicity of Zoonotic Trematode Metacercariae in Fish from Deokcheon-gang (River) in Sancheong-gun, Gyeongsangnam-do, Republic of Korea
Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Hee Il Lee, Jung-Won Ju, Myoung-Ro Lee, Jeong-Gil Park, Jihee Ahn
The Korean Journal of Parasitology.2021; 59(5): 523. CrossRef
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Yuru Wang, Xin Li, Qingsong Sun, Pengtao Gong, Nan Zhang, Xichen Zhang, Xiaocen Wang, Guojiang Li, Jianhua Li
International Journal for Parasitology: Parasites and Wildlife.2020; 13: 7. CrossRef
Morphological and Molecular Characteristics of Clinostomid Metacercariae from Korea and Myanmar
Eun Jeong Won, Yu Jeong Lee, Moon-Ju Kim, Jong-Yil Chai, Byoung-Kuk Na, Woon-Mok Sohn
The Korean Journal of Parasitology.2020; 58(6): 635. CrossRef

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Echinostoma macrorchis Metacercariae in Cipangopaludina chinensis malleata from Xiengkhuang Province, Lao PDR and Morphologies of Adults from Experimental Animals: Woon-Mok Sohn, Byoung-Kuk Na, Dongmin Lee, Keeseon S. Eom, Tai-Soon Yong, Jong-Yil Chai, Duk-Young Min; Korean J Parasitol 2019;57(6):657-664.
Published online December 31, 2019; DOI: https://doi.org/10.3347/kjp.2019.57.6.657

Abstract
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We identified the echinostome metacercariae in Chinese mystery snails, Cipangopaludina chinensis malleata, from Xiengkhuang Province, Lao PDR with morphologies of adult worms recovered. Total 20 snails were examined with artificial digestion method and then the collected metacercariae were orally infected to a mouse and a rat. Adult worms recovered from experimental animals were observed with a light microscope and a SEM. The metacercariae were round, 125×123 ?m in average size, with a moderately thick cyst wall, collar spines distributed in the head collar and excretory granules in 2 canals of excretory tube. Adult flukes (3-week-old in a rat) were elongated, ventrally curved and 5.310×1.023 mm in average size. Head collar distinct, bearing 43 collar spines with 5 end group ones on each side. Oral sucker subterminal, prepharynx very short, pharynx well developed, and esophagus relatively short. Cirrus sac well developed, with a saccular seminal vesicle, and ventral sucker very large. Ovary round and on the median line of the body. Testes tandom and elongated. Eggs operculated, elliptical and 90×57 ?m in average size. In the SEM observation, the head crown prominent, with 43 collar spines resembled with horns of younger stag. Scale-like tegumental spines were densely distributed on the surface between the head collar and ventral sucker, and their densities were decreased posteriorly. Conclusively, the metacercariae detected in C. chinensis malleata from Lao PDR were identified as those of Echinostoma macrorchis based on the morphological characteristics of adult worms.

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Wasin Panich, Thanawan Tejangkura, Thapana Chontananarth
Research in Veterinary Science.2025; 185: 105539. CrossRef
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Yu Cao, Ye Li, Zhong-Yan Gao, Bo-Tao Jiang
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Wasin Panich, Phonkawin Jaruboonyakorn, Awika Raksaman, Thanawan Tejangkura, Thapana Chontananarth
International Journal of Food Microbiology.2024; 418: 110732. CrossRef
High diversity of trematode metacercariae that parasitize freshwater gastropods in Bangkok, Thailand, and their infective situations, morphologies and phylogenetic relationships
Pichit Wiroonpan, Thapana Chontananarth, Jong-Yil Chai, Watchariya Purivirojkul
Parasitology.2022; 149(7): 913. CrossRef
Unravelling another mystery: Parasite escape and host‐switching vary spatially in non‐indigenous populations of Japanese mystery snails
Amy E. Fowler, Grace A. Loonam, April M. H. Blakeslee
Freshwater Biology.2022; 67(8): 1316. CrossRef
Snail-borne zoonotic trematodes in edible viviparid snails obtained from wet markets in Northern Thailand
K. Chantima, C. Rika
Journal of Helminthology.2020;[Epub] CrossRef

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Letter to the Editor

Reconsideration of Dr. Allen’s Report about Hemoptysis Patients from High Prevalence of Archaeoparasitological Paragonimiasis in Korea: Min Seo, Jong-Yil Chai, Jong Ha Hong, Dong Hoon Shin; Korean J Parasitol 2019;57(6):635-638.
Published online December 31, 2019; DOI: https://doi.org/10.3347/kjp.2019.57.6.635

Abstract
PDF

Horace N. Allen, an American physician, was a Presbyterian missionary to Korea. In 1886, he wrote the annual report of the Korean government hospital, summarizing patient statistics according to outpatient and inpatient classification for the first ever in Korean history. In the report, he speculated that hemoptysis cases of outpatient might have been mainly caused by distoma. Allen’s conjecture was noteworthy because only a few years lapsed since the first scientific report of paragonimiasis. However, he was not sure of his assumption either because it was not evidently supported by proper microscopic or post-mortem examinations. In this letter, we thus revisit his assumption with our parasitological data recently obtained from Joseon period mummies.

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Paleoparasitology research on ancient helminth eggs and larvae in the Republic of Korea
Jong-Yil Chai, Min Seo, Dong Hoon Shin
Parasites, Hosts and Diseases.2023; 61(4): 345. CrossRef

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Brief Communication

Low Levels of Polymorphisms and Negative Selection in Plasmodum knowlesi Merozoite Surface Protein 8 in Malaysian Isolates: Md Atique Ahmed, Hae-Ji Kang, Fu-Shi Quan; Korean J Parasitol 2019;57(4):445-450.
Published online August 31, 2019; DOI: https://doi.org/10.3347/kjp.2019.57.4.445

Abstract
PDF

Human infections due to the monkey malaria parasite Plasmodium knowlesi is increasingly being reported from most Southeast Asian countries specifically Malaysia. The parasite causes severe and fatal malaria thus there is a need for urgent measures for its control. In this study, the level of polymorphisms, haplotypes and natural selection of full-length pkmsp8 in 37 clinical samples from Malaysian Borneo along with 6 lab-adapted strains were investigated. Low levels of polymorphism were observed across the full-length gene, the double epidermal growth factor (EGF) domains were mostly conserved, and non-synonymous substitutions were absent. Evidence of strong negative selection pressure in the non-EGF regions were found indicating functional constrains acting at different domains. Phylogenetic haplotype network analysis identified shared haplotypes and indicated geographical clustering of samples originating from Peninsular Malaysia and Malaysian Borneo. This is the first study to genetically characterize the full-length msp8 gene from clinical isolates of P. knowlesi from Malaysia; however, further functional characterization would be useful for future rational vaccine design.

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Plasmodium knowlesi: the game changer for malaria eradication
Wenn-Chyau Lee, Fei Wen Cheong, Amirah Amir, Meng Yee Lai, Jia Hui Tan, Wei Kit Phang, Shahhaziq Shahari, Yee-Ling Lau
Malaria Journal.2022;[Epub] CrossRef

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Original Articles

Infection Status with Clinostomum complanatum Metacercariae in Fish from Water Systems of Nakdong-gang (River) in Korea: Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho; Korean J Parasitol 2019;57(4):389-397.
Published online August 31, 2019; DOI: https://doi.org/10.3347/kjp.2019.57.4.389

Abstract
PDF

The infection status of Clinostomum complanatum metacercariae (CcMc) was broadly surveyed in fishes from water systems of Nakdong-gang (River) in the Republic of Korea (Korea) for 5 years. All 4,468 fishes collected were individually examined by the artificial digestion methods. No CcMc were detected in fishes from Naeseongcheon in Yecheon-gun, Gigyecheon in Gyeongju-si, Gyeongsangbuk-do, and Hamancheon in Haman-gun, Gyeongsangnam-do. In fishes from Wicheon in Gunwi-gun, Gyeongsangbuk-do, CcMc were detected in 180 (15.4%) out of 1,168 fishes and their intensity was 5.8 per fish infected. The prevalences with CcMc in positive fish species from 3 other surveyed areas, i.e., Banbyeoncheon in Yeongyang-gun, Nakdong-gang in Sangju-si and Hoecheon in Goryeong-gun, in Gyeongsangbuk-do were 19.3%, 33.3%, and 19.0% and their intensities were 1.5, 17.6, and 2.6 per fish infected respectively. In fishes from Yangcheon in Sancheong-gun, Gyeongsangnam-do, CcMc were detected in 811 (45.6%) out of 1,779 fishes examined and their intensity was 9.8 per fish infected. The prevalence was most high in Squalidus spp. (97.7%) and followed by acheilognathinid fish (66.8%), Pungtungia herzi (52.0%), rasborinid fish (39.6%) and Hemibarbus spp. (25.9%) from Yangcheon. The intensity was also most high in Squalidus spp. (27.0). The endemicity with CcMc was very low in fishes from water systems of Nakdong-gang in the east coast of Korea. Conclusively, it is confirmed that various fish species act as the second intermediate hosts of C. complanatum, and the endemicities of CcMc are more or less different by the fish species and group from Yangcheon, in Sancheong-gun, Gyeongsangnam-do, Korea

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Marcos Tavares-Dias, Luís Mauricio Abdon Silva, Alexandro Cezar Florentino
Studies on Neotropical Fauna and Environment.2023; 58(1): 116. CrossRef
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Hyun-Gyu Kim, Ji-Hee Han, Ji-Yoon Kwak, Han Kyu Jeon, Sang-Soo Lee, Hyun Jin Kim, Seul Ki Song, Byoung-Kuk Na, Ra-Ri Cha
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Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Cheon-Hyeon Kim, Min-Ah Hwang, Kyeong-Woo No, Jai-Dong Kim
The Korean Journal of Parasitology.2021; 59(1): 23. CrossRef
Prevalence and Infection Intensity of Zoonotic Trematode Metacercariae in Fish from Soyang-cheon (Stream), in Wanju-gun, Jeollabuk-do, Korea
Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Jung-Won Ju, Cheon-Hyeon Kim, Min-Ah Hwang, Kyeong-Woo No, Jong-Ho Park
The Korean Journal of Parasitology.2021; 59(3): 265. CrossRef
Morphological and Molecular Characteristics of Clinostomid Metacercariae from Korea and Myanmar
Eun Jeong Won, Yu Jeong Lee, Moon-Ju Kim, Jong-Yil Chai, Byoung-Kuk Na, Woon-Mok Sohn
The Korean Journal of Parasitology.2020; 58(6): 635. CrossRef

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Infections with Digenetic Trematode Metacercariae in Freshwater Fishes from Two Visiting Sites of Migratory Birds in Gyeongsangnam-do, Republic of Korea: Woon-Mok Sohn, Byoung-Kuk Na; Korean J Parasitol 2019;57(3):273-281.
Published online June 30, 2019; DOI: https://doi.org/10.3347/kjp.2019.57.3.273

Abstract
PDF

The infection status of digenetic trematode metacercariae (DTM) was investigated in fishes from 2 representative visiting sites of migratory birds in Gyeongsangnam-do, the Republic of Korea (Korea). A totaly 220 freshwater fishes (7 species) were collected from Junam-jeosuji (reservoir), and 127 fishes (7 species) were also collected from Woopo-neup (swamp) in June and October 2017. As the control group, total 312 fish (22 spp.) from Yangcheon in Sancheong-gun, Gyeongsangnam-do were also collected in June and October 2017. All fishes collected in 3 sites were examined with the artificial digestion method. In the fishes from Junam-jeosuji, more than 4 species, i.e., Clonorchis sinensis, Echinostoma spp., Diplostomum spp. and Cyathocotyle orientalis, of DTM were detected and their endemicy was very low, 0.70. More than 6 species, i.e., C. sinensis, Echinostoma spp., Metorchis orientalis, Clinostomum complanatum, Diplostomum spp. and C. orientalis, of DTM were found in the fishes from Woopo-neup, and their endemicy was low, 5.16. In the fishes from Yangcheon, more than 8 species, i.e., C. sinensis, Metagonimus spp., Centrocestus armatus, C. complanatum, C. orientalis, M. orientalis, Echinostoma spp., and Diplostomum spp., of DTM were detected, and their endemicity was relatively high, 95.48. The percentages of avian trematode metacercariae (ATM) were 99.6% and 94.7% in fishes from Junam-jeosuji and Woopo-neup whereas it was 74.1% in the control site, Yangcheon. The above findings suggested that migratory birds partly affect in endemicity of DTM in the fish in the 2 visiting sites in Gyeongsangnam-do, Korea.

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The Korean Journal of Parasitology.2019; 57(6): 647. CrossRef

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Dipenyleneiodonium Induces Growth Inhibition of Toxoplasma gondii through ROS Induction in ARPE-19 Cells: Pu Reum Sun, Fei Fei Gao, Hei Gwon Choi, Wei Zhou, Jae-Min Yuk, Jaeyul Kwon, Young-Ha Lee, Guang-Ho Cha; Korean J Parasitol 2019;57(2):83-92.
Published online April 30, 2019; DOI: https://doi.org/10.3347/kjp.2019.57.2.83

Based on the reactive oxygen species (ROS) regulatory properties of diphenyleneiodonium (DPI), we investigated the effects of DPI on host-infected T. gondii proliferation and determined specific concentration that inhibit the intracellular parasite growth but without severe toxic effect on human retinal pigment epithelial (ARPE-19) cells. As a result, it is observed that host superoxide, mitochondria superoxide and H2O2 levels can be increased by DPI, significantly, followed by suppression of T. gondii infection and proliferation. The involvement of ROS in anti-parasitic effect of DPI was confirmed by finding that DPI effect on T. gondii can be reversed by ROS scavengers, N-acetyl-L-cysteine and ascorbic acid. These results suggest that, in ARPE-19 cell, DPI can enhance host ROS generation to prevent T. gondii growth. Our study showed DPI is capable of suppressing T. gondii growth in host cells while minimizing the un-favorite side-effect to host cell. These results imply that DPI as a promising candidate material for novel drug development that can ameliorate toxoplasmosis based on ROS regulation.

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Brief Communication

Molecular Identification of Anisakis Larvae Extracted by Gastrointestinal Endoscopy from Health Check-up Patients in Korea: Hyemi Song, Bong-Kwang Jung, Jaeeun Cho, Taehee Chang, Sun Huh, Jong-Yil Chai; Korean J Parasitol 2019;57(2):207-211.
Published online April 30, 2019; DOI: https://doi.org/10.3347/kjp.2019.57.2.207

Anisakiasis is a zoonotic disease induced by anisakid nematodes, and endoscopic inspection is used for a diagnosis or remedy for it. Anisakis simplex, Anisakis physeteris, and Pseudoterranova decipiens had been reported to be the major species causing human infections, particularly, in Japan. However, in Korea, recent studies strongly suggested that Anisakis pegreffii is the major species of human infections. To support this suggestion, we collected anisakid larvae (n=20) from 20 human patients who were undergone gastrointestinal endoscopy at a health check-up center in Korea, and molecular identification was performed on the larvae using PCR-RFLP analysis and gene sequencing of rDNA ITS regions and mtDNA cox2. In addition, anisakid larvae (n=53) collected from the sea eel (Astroconger myriaster) were also examined for comparison with those extracted from humans. The results showed that all human samples (100%) were identified as A. pegreffii, whereas 90.7% of the samples from the sea eel were A. pegreffii with the remaining 9.3% being Hysterothylacium aduncum. Our study confirmed that A. pegreffii is the predominant species causing human anisakiasis in Korea, and this seems to be due to the predominance of this larval type in the fish (sea eels) popularly consumed by the Korean people. The possibility of human infection with H. aduncum in Korea is also suggested.

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Original Article

Infection Status with Clonorchis sinensis Metacercariae in Fish from Yangcheon (Stream) in Sancheong-gun, Gyeongsangnam-do, Korea: Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Jung-Won Ju; Korean J Parasitol 2019;57(2):145-152.
Published online April 30, 2019; DOI: https://doi.org/10.3347/kjp.2019.57.2.145

Abstract
PDF

The infection status with Clonorchis sinensis metacercariae (CsMc) was examined in freshwater fishes from Yangcheon (a branch of Gyeongho-gang), which is located in Sancheong-gun, Gyeongsangnam-do, the Republic of Korea. Total 2,201 fishes in 26 species were examined by the artificial digestion method through 7 years. CsMc were detected in 1,171 (53.2%) fishes in 21 spp. (80.8%) and their density was 85 per fish infected. Total 532 (99.6%) out of 534 Pungtungia herzi (index fish) examined were infected with 147 CsMc per fish infected. Metacercarial densities in this fish were highest in 2015 (179 CsMc), followed by 2012 (168), 2013 (152), 2016 (145), 2014 (114), and 2017 (89) respectively. In the gobioninid fish group, i.e., P. herzi, Sarcocheilichthys spp., Squalidus spp., Pseudogobio esocinus, Hemibarbus longirostris, and Hemibarbus labeo, 841 (92.7%) fishes were infected with 117 CsMc per fish infected. Total 250 (54.7%) acheilognathinid fish (bitterlings), Acheilognathus spp. and Acanthorhodeus spp. were infected with 5.8 CsMc. In the rasborinid fish (chubs) group, i.e., Zacco platypus, Zacco temminckii, and Zacco koreanus, 77 (13.7%) out of 563 fish examined were infected with 2.4 CsMc in average. The susceptibility indices of CsMc were 49.09 in the overall positive fish group, 104.15 in the gobioninid group, 3.17 in the acheilognathinid group and 0.35 in the rasborinid fish group respectively. Only 1 CsMc was detected in 3 fish species, Coreoperca herzi, Channa argus, and Lepomis macrochirus, respectively. Conclusively, it was confirmed that CsMc are moderately prevalent in fishes from Yangcheon in Sancheon-gun, Gyeongsangnam-do, Korea.

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Survey of Zoonotic Trematode Metacercariae in Fish from Water Systems of Geum-gang (River) in Republic of Korea
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The Korean Journal of Parasitology.2021; 59(1): 23. CrossRef
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The Korean Journal of Parasitology.2021; 59(1): 97. CrossRef
Prevalence and Infection Intensity of Zoonotic Trematode Metacercariae in Fish from Soyang-cheon (Stream), in Wanju-gun, Jeollabuk-do, Korea
Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Jung-Won Ju, Cheon-Hyeon Kim, Min-Ah Hwang, Kyeong-Woo No, Jong-Ho Park
The Korean Journal of Parasitology.2021; 59(3): 265. CrossRef
Survey of Zoonotic Trematode Metacercariae in Fish from Irrigation Canal of Togyo-jeosuji (Reservoir) in Cheorwon-gun, Gangwon-do, Republic of Korea
Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Hee Il Lee, Jung-Won Ju, Myoung-Ro Lee, Eun-Joo Lim, Sung Yong Son, Eunmi Ko, Jaeseok Choi
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The Korean Journal of Parasitology.2021; 59(5): 523. CrossRef

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Brief Communications

Infection Status of Isthmiophora hortensis Metacercariae in Dark Sleepers, Odontobutis Species, from Some Water Systems of the Republic of Korea: Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Jung-Won Ju; Korean J Parasitol 2018;56(6):633-637.
Published online December 31, 2018; DOI: https://doi.org/10.3347/kjp.2018.56.6.633

Abstract
PDF

Present study was performed to survey on infection status of Isthmiophora hortensis (formerly Echinostoma hortense) metacercariae (IhMc) in dark sleepers, Odontobutis spp., from some water systems of the Republic of Korea. A total of 237 Odontobutis spp. was collected in the water systems of 5 rivers, i.e., Mangyeong-gang (gang means river), Geum-gang, Tamjin-gang, Seomjin-gang, and Nakdong-gang. They were all examined with artificial digestion method for 5 years (2013-2017). A total of 137 (57.8%) Odontobutis spp. were infected with 14.8 IhMc in average. The prevalence was the highest in Nakdong-gang areas (62.9%) and followed by in Mangyeong-gang (57.1%), Geum-gang (56.3%), Tamjin-gang (54.8%), and Seomjin-gang (53.9%) areas. Metacercarial densities were 28.1 (Geum-gang), 13.9 (Mangyeong-gang), 13.3 (Nakdong-gang), 13.1 (Tamjin-gang), and 2.3 (Seomjin-gang) per infected fish. Especially, in case of Yugucheon (cheon means stream), a branch of Geum-gang, IhMc were detected in all fish (100%) examined and their density was about 48 per fish. By the present study, it was confirmed that the infection status of IhMc is more or less different by the surveyed areas and the dark sleepers, Odontobutis spp., are suitable fish hosts of I. hortensis.

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Survey of Zoonotic Trematode Metacercariae in Fish from Irrigation Canal of Togyo-jeosuji (Reservoir) in Cheorwon-gun, Gangwon-do, Republic of Korea
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The Korean Journal of Parasitology.2021; 59(4): 427. CrossRef
Endemicity of Zoonotic Trematode Metacercariae in Fish from Deokcheon-gang (River) in Sancheong-gun, Gyeongsangnam-do, Republic of Korea
Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Hee Il Lee, Jung-Won Ju, Myoung-Ro Lee, Jeong-Gil Park, Jihee Ahn
The Korean Journal of Parasitology.2021; 59(5): 523. CrossRef
Infections with Digenetic Trematode Metacercariae in Freshwater Fishes from Two Visiting Sites of Migratory Birds in Gyeongsangnam-do, Republic of Korea
Woon-Mok Sohn, Byoung-Kuk Na
The Korean Journal of Parasitology.2019; 57(3): 273. CrossRef
Infection Status with Clinostomum complanatum Metacercariae in Fish from Water Systems of Nakdong-gang (River) in Korea
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The Korean Journal of Parasitology.2019; 57(4): 389. CrossRef
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The Korean Journal of Parasitology.2019; 57(6): 647. CrossRef

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Infections with Digenean Trematode Metacercariae in Two Invasive Alien Fish, Micropterus salmoides and Lepomis macrochirus, in Two Rivers in Chungcheongbuk-do, Republic of Korea: Seongjun Choe, Hansol Park, Dongmin Lee, Yeseul Kang, Hyeong-Kyu Jeon, Keeseon S. Eom; Korean J Parasitol 2018;56(5):509-513.
Published online October 31, 2018; DOI: https://doi.org/10.3347/kjp.2018.56.5.509

Abstract
PDF

Present study was performed to survey infection status of digenetic trematode metacercariae in 2 alien fish species, Micropterus salmoides (largemouth bass) and Lepomis macrochirus (bluegill), in 2 rivers draining Chungcheongbuk-do, Republic of Korea. A total of 107 largemouth bass and 244 bluegills were caught in Daecheong-ho (ho=lake) and Musim-cheon (a branch of Geum-gang), in Chungcheongbuk-do April-July 2015. Additionally, 68 native fish of 5 species, i.e., Zacco platypus, Hemibarbus longirostris, Carassius auratus, Pseudogobio esocinus and Puntungia herzi, were caught from the same water bodies. All of the fish collected were examined by artificial digestion method. The metacercariae of Centrocestus armatus, Clinostomum complanatum, Metagonimus sp. and Diplostomum spp. were detected from 4 out of 5 native fish species in Daecheong-ho. However, any metacercariae were not found from 87 M. salmoides and 177 L. macrochirus in Daecheong-ho. In Musim-cheon, metacercariae of Exorchis oviformis and Metacercaria hasegawai were detected from 78% Z. platypus and 34% L. macrochirus, but any metacercariae not found in M. salmoides. We report here that the 2 alien fish species were less infected with the metacercariae than the native ones. Surveys on the metacercariae in the alien fish species in geographically various rivers should be undertaken for better understanding on the role of alien fish species in the trematode infections in Republic of Korea.

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Infection Characteristics of Clonorchis sinensis Metacercariae in Fish from Republic of Korea
Woon-Mok Sohn
The Korean Journal of Parasitology.2022; 60(2): 79. CrossRef
Characterization of Fish Assemblages and Standard Length Distributions among Different Sampling Gears Using an Artificial Neural Network
Tae-Sik Yu, Chang Woo Ji, Young-Seuk Park, Kyeong-Ho Han, Ihn-Sil Kwak
Fishes.2022; 7(5): 275. CrossRef
Survey of Zoonotic Trematode Metacercariae in Fish from Water Systems of Geum-gang (River) in Republic of Korea
Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Cheon-Hyeon Kim, Min-Ah Hwang, Kyeong-Woo No, Jai-Dong Kim
The Korean Journal of Parasitology.2021; 59(1): 23. CrossRef
Diagnosis of Centrocestus formosanus Infection in Zebrafish (Danio rerio) in Italy: A Window to a New Globalization-Derived Invasive Microorganism
Antonino Pace, Ludovico Dipineto, Serena Aceto, Maria Concetta Censullo, Maria Carmen Valoroso, Lorena Varriale, Laura Rinaldi, Lucia Francesca Menna, Alessandro Fioretti, Luca Borrelli
Animals.2020; 10(3): 456. CrossRef
Infection Status with Clonorchis sinensis Metacercariae in Fish from Yangcheon (Stream) in Sancheong-gun, Gyeongsangnam-do, Korea
Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Jung-Won Ju
The Korean Journal of Parasitology.2019; 57(2): 145. CrossRef

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Prevalence and Phylogenetic Analyses of Trichuris suis in Pigs in Hunan Province, Subtropical China: Lei Tan, Aibing Wang, Jing Yi, Yisong Liu, Jiayu Li, Wei Liu; Korean J Parasitol 2018;56(5):495-500.
Published online October 31, 2018; DOI: https://doi.org/10.3347/kjp.2018.56.5.495

Abstract
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Trichuris suis infection in pigs is ubiquitous in intensive and extensive farms, which causes potential threat to human health. The
objective
of this research was to investigate the prevalence of T. suis in pigs in Hunan province. Total 2,267 fresh fecal samples distributed in 28 pig farms from 7 different administrative regions (Hunan province) were evaluated for the existence of T. suis eggs using saturated NaCl floating method. The average infection rate of T. suis in pigs was 8.91% in Hunan province. To determine genetic variation of the gained T. suis isolates in the present study, the internal transcribed spacer (ITS) regions from nuclear ribosomal DNA (rDNA) of 7 T. suis isolates were cloned and analyzed. Nucleotide diversities were 1.0-3.5% and 0-3.8% for ITS-1 and ITS-2, respectively. Phylogenetic analyses indicated that all isolates collected in the present study and T. suis available in Genbank generated a monophyletic clade. The present investigation revealed high infection rates of T. suis in pigs in Hunan province, which shed light on making effective measures to prevent and control T. suis infection in pigs in Hunan province.

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Original Articles

Infection Status with Metagonimus spp. Metacercariae in Fishes from Seomjin-gang and Tamjin-gang in Republic of Korea: Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Jung-Won Ju, Cheon-Hyeon Kim, Ki-Bok Yoon; Korean J Parasitol 2018;56(4):351-358.
Published online August 31, 2018; DOI: https://doi.org/10.3347/kjp.2018.56.4.351

Abstract
PDF

To grasp the infection status of Metagonimus spp. metacercariae (MsMc), the freshwater fishes were surveyed from Seomjin-gang (river) and Tamjin-gang in the Republic of Korea. Total 1,604 fishes from 7 local sites of Seomjin-gang and 1,649 fishes from 2 sites of Tamjin-gang were examined for 6 years (2012-2017) by the artificial digestion method. MsMc were detected in fishes from 7 sites, i.e., Osucheon in Imsil-gun (36.3% fish in 6 spp.), Seomjin-gang in Sunchanggun (49.8% in 18 spp.), Songdaecheon in Namwon-si (64.5% in 8 spp.), Seomjin-gang in Gokseong-gun (72.4% in 14 spp.) and in Gurye-gun (78.8% in 17 spp.), Hoengcheon (75.9% in 11 spp.) and Namsancheon (58.9% in 7 spp.) in Hadong-gun. Their average densities were 4.2, 86.8, 39.9, 43.1, 246.5, 173.6 and 67.5 per fish infected respectively. Prevalence with MsMc in rasborinid fish from Seomjin-gang was 89.2% and their intensity was 73.6 per fish infected. Endemicities of MsMc in rasborinid fish from Seomjin-gang were significantly higher in fishes from the lower reaches (prevalence: 98.7%; density: 137) rather than in fishes from the middle (93.5%; 38) and upper (72.4%; 13) reaches. MsMc were also detected in 56.1% and 66.4% fishes from 2 surveyed areas, i.e., the middle reaches in Jangheung-gun and the lower reaches in Gangjin-gun, of Tamjin-gang, and their densities were 147 and 121 per fish infected. In susceptible fishes from Tamjin-gang, the prevalence was 84.1% and density was 227 per fish infected. By the present study, it was confirmed that MsMc is highly prevalent in the fishes from Seomjin-gang and Tamjin-gang in Korea.

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Infection characteristics of Metagonimus species (Digenea: Heterophyidae) metacercariae in fish from major rivers of Korea
Woon-Mok Sohn
Parasites, Hosts and Diseases.2024; 62(1): 1. CrossRef
Prevalence and Infection Intensity of Zoonotic Trematode Metacercariae in Fish from Soyang-cheon (Stream), in Wanju-gun, Jeollabuk-do, Korea
Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Jung-Won Ju, Cheon-Hyeon Kim, Min-Ah Hwang, Kyeong-Woo No, Jong-Ho Park
The Korean Journal of Parasitology.2021; 59(3): 265. CrossRef
Survey of Zoonotic Trematode Metacercariae in Fish from Irrigation Canal of Togyo-jeosuji (Reservoir) in Cheorwon-gun, Gangwon-do, Republic of Korea
Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Hee Il Lee, Jung-Won Ju, Myoung-Ro Lee, Eun-Joo Lim, Sung Yong Son, Eunmi Ko, Jaeseok Choi
The Korean Journal of Parasitology.2021; 59(4): 427. CrossRef
Endemicity of Zoonotic Trematode Metacercariae in Fish from Deokcheon-gang (River) in Sancheong-gun, Gyeongsangnam-do, Republic of Korea
Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Hee Il Lee, Jung-Won Ju, Myoung-Ro Lee, Jeong-Gil Park, Jihee Ahn
The Korean Journal of Parasitology.2021; 59(5): 523. CrossRef
Infections with Digenetic Trematode Metacercariae in Freshwater Fishes from Two Visiting Sites of Migratory Birds in Gyeongsangnam-do, Republic of Korea
Woon-Mok Sohn, Byoung-Kuk Na
The Korean Journal of Parasitology.2019; 57(3): 273. CrossRef
Infection Status with Clinostomum complanatum Metacercariae in Fish from Water Systems of Nakdong-gang (River) in Korea
Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho
The Korean Journal of Parasitology.2019; 57(4): 389. CrossRef
Infection Status with Digenetic Trematode Metacercariae in Fishes from Coastal Lakes in Gangwon-do, Republic of Korea
Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Soon-Won Lee
The Korean Journal of Parasitology.2019; 57(6): 681. CrossRef

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Infections with Centrocestus armatus Metacercariae in Fishes from Water Systems of Major Rivers in Republic of Korea: Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Jung-Won Ju, Cheon-Hyeon Kim, Ki-Bok Yoon, Jai-Dong Kim, Dong Cheol Son, Soon-Won Lee; Korean J Parasitol 2018;56(4):341-349.
Published online August 31, 2018; DOI: https://doi.org/10.3347/kjp.2018.56.4.341

The infection status of Centrocestus armatus metacercariae (CaMc) was broadly surveyed in freshwater fishes from major river systems in the Republic of Korea (Korea) during 2008-2017. A total of 14,977 fishes was caught and examined by the artificial digestion method. CaMc were detected in 3,818 (97.1%) (2,114 Z. platypus: 96.1% and 1,704 Z. temminckii: 98.4%) out of 3,932 Zacco spp. examined and their density was 1,867 (2,109 in Z. platypus and 1,567 in Z. temminckii) per fish infected. The prevalences with CaMc were high, 93.7-100%, in Zacco spp. from all surveyed areas. However, their densities were more or less different by the surveyed areas and fish species. They were most high in Nakdong-gang in Gyeongsangnam-do (4,201 in average), and followed by Geum-gang (2,343), Nakdong-gang in Gyeongsangbuk-do (1,623), Han-gang (1,564), Tamjin-gang and Yeongsan-gang (1,540), streams in the east coast (1,028), Seomjin-gang (488) and Mangyeong-gang (170). In another species of rasborinid fish, Opsariichthys uncirostris amurensis, CaMc were detected in 222 (74.8%) out of 297 ones examined and their density was 278 (1-4,480) per fish infected. CaMc were also detected in total 41 fish species except for the rasborinid fish, Z. platypus, Z. temminckii and O. uncirostris amurensis. Conclusively, it was confirmed that among the 3 species of rasborinid fish, Z. platypus and Z. temminckii are highly prevalent and O. uncirostris amurensis is moderately prevalent with CaMc. Additionally, we could know that variety of fish species act as the second intermediate hosts of C. armatus in Korea.

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Survey of Zoonotic Trematode Metacercariae in Fish from Water Systems of Geum-gang (River) in Republic of Korea
Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Cheon-Hyeon Kim, Min-Ah Hwang, Kyeong-Woo No, Jai-Dong Kim
The Korean Journal of Parasitology.2021; 59(1): 23. CrossRef
Prevalence and Infection Intensity of Zoonotic Trematode Metacercariae in Fish from Soyang-cheon (Stream), in Wanju-gun, Jeollabuk-do, Korea
Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Jung-Won Ju, Cheon-Hyeon Kim, Min-Ah Hwang, Kyeong-Woo No, Jong-Ho Park
The Korean Journal of Parasitology.2021; 59(3): 265. CrossRef
Optimization of tools for the detection and identification of Cryptocotyle metacercariae in fish: Digestion method and viability studies
Maureen Duflot, Graziella Midelet, Odile Bourgau, Kurt Buchmann, Mélanie Gay
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Survey of Zoonotic Trematode Metacercariae in Fish from Irrigation Canal of Togyo-jeosuji (Reservoir) in Cheorwon-gun, Gangwon-do, Republic of Korea
Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Hee Il Lee, Jung-Won Ju, Myoung-Ro Lee, Eun-Joo Lim, Sung Yong Son, Eunmi Ko, Jaeseok Choi
The Korean Journal of Parasitology.2021; 59(4): 427. CrossRef
Endemicity of Zoonotic Trematode Metacercariae in Fish from Deokcheon-gang (River) in Sancheong-gun, Gyeongsangnam-do, Republic of Korea
Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Hee Il Lee, Jung-Won Ju, Myoung-Ro Lee, Jeong-Gil Park, Jihee Ahn
The Korean Journal of Parasitology.2021; 59(5): 523. CrossRef
Diagnosis of Centrocestus formosanus Infection in Zebrafish (Danio rerio) in Italy: A Window to a New Globalization-Derived Invasive Microorganism
Antonino Pace, Ludovico Dipineto, Serena Aceto, Maria Concetta Censullo, Maria Carmen Valoroso, Lorena Varriale, Laura Rinaldi, Lucia Francesca Menna, Alessandro Fioretti, Luca Borrelli
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Effect of pollutants on biochemical properties of microorganisms
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Hygiene and sanitation.2020; 99(4): 368. CrossRef
Infection Status with Digenetic Trematode Metacercariae in Fishes from Coastal Lakes in Gangwon-do, Republic of Korea
Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Soon-Won Lee
The Korean Journal of Parasitology.2019; 57(6): 681. CrossRef

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Opisthorchis felineus and Metorchis bilis Metacercariae in Cyprinid Fish Leuciscus idus in Nura-Sarysu River, Kazakhstan: Vladimir S. Kiyan, Aitbay K. Bulashev, Aleksey V. Katokhin; Korean J Parasitol 2018;56(3):267-274.
Published online June 30, 2018; DOI: https://doi.org/10.3347/kjp.2018.56.3.267

Abstract
PDF

Aim
of the present study was to provide presence of opisthorchiid metacercariae in cyprinid fish Leuciscus idus in Nura-Sarysu river, Kazakhstan. Infection rate of the ides by the metacercariae was 42%. The metacercariae, similar morphologically to those of the liver flukes, were found: elliptical in shape, 0.19-0.25×0.15-0.22 mm, oral and ventral suckers nearly equal size, and excretory bladder O-shape with black content, occupying posterior part of the body. The metacercariae were divided into 2 groups with differences in size and thickness of cyst wall. Adult flukes were recovered from the Syrian hamsters infected with the opisthorch metacercariae and identified with morphological characters to Opisthorchis felineus and Metorchis bilis. DNA sequences of ITS1, ITS2, and cox1 supported the taxonomic assignment.

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Molecular differentiation of Opisthorchis felineus and Metorchis bilis in cyprinid fish from Northern Kazakhstan: Epidemiological insights and diagnostic advances
Aiganym Bekaidarovna Bekenova, Aleksey М. Katokhin, Kundyz B. Muratbekova
Veterinary World.2025; : 3197. CrossRef
Prevalence and species identification of trematode metacercariae in Qiqihar, Northeast China
Fengyu Zhang, Jianke Li, Shaocheng Zhang, Ting Chen, Hao Zhang
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Anna Kovner, Yaroslav Kapushchak, Oxana Zaparina, Dmitry Ponomarev, Maria Pakharukova
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Molecular genetic species definition of Opisthorchiidae-like cercariae from Bithyniidae snails of Chany Lake (South-Western Siberia, Russia)
Aleksei V. Katokhin, Elena A. Serbina
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Fish-borne trematode infections in wild fishes in Bangladesh
Sharmin S. Labony, M. Abdul Alim, Muhammad Mehedi Hasan, Md. Shahadat Hossain, Ausraful Islam, Mohammad Zahangir Alam, Naotoshi Tsuji, Anisuzzaman
Pathogens and Global Health.2020; 114(2): 91. CrossRef

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Infections with Zoonotic Trematode Metacercariae in Yellowfin Goby, Acanthogobius flavimanus, from Coastal Areas of Republic of Korea: Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Jung-Won Ju, Soon-Won Lee, Won-Seok Seok; Korean J Parasitol 2018;56(3):259-265.
Published online June 30, 2018; DOI: https://doi.org/10.3347/kjp.2018.56.3.259

Abstract
PDF

To investigate the infection status of zoonotic trematode metacercariae in yellowfin goby, Acanthogobius flavimanus, from coastal areas of the Republic of Korea (Korea), we examined total 344 gobies from 21 localities with an artificial digestion method from 2013 to 2017. The metacercariae of Stictodora lari were most frequently detected in 45.3% goby from 7 localities, i.e., Taean-gun (Chungcheongnam-do), Gochang-gun (Jeollabuk-do), Muan-gun, Shinan-gun, Haenam-gun (Jeollanam-do), Hadong-gun and Goseong-gun (Gyeongsangnam-do). Their infection rates were 90.0%, 66.7%, 46.7%, 8.0%, 3.3%, 26.7%, and 86.7% and intensities were 1,090, 6.2, 1.6 1.0, 2.0, 2.0, and 7.2 metacercariae per fish infected respectively. Heterophyopsis continua metacercariae were found in 38.2% goby from 6 localities, i.e., Gochang-gun, Muan-gun, Shinan-gun, Gangjin-gun, Boseong-gun (Jeollanam-do) and Goseong-gun, and their intensities were relatively low, 1-21 metacercariae. Stictodora fuscata metacercariae were detected in 61.3% goby from 4 localities, i.e., Taean-gun, Gochang-gun, Hadong-gun and Goseong-gun. Their infection rates were 90.0%, 53.3%, 5.9%, and 73.3% and intensities were 1,081, 3.1, 3.0, and 10.2 metacercariae per fish infected respectively. Heterophyes nocens metacercariae were found in 55.0% goby from Muan-gun and Shinan-gun. Total 3 metacercariae of Isthmiophora hortensis were detected in 2 (8.0%) gobies from Shinan-gun. Total 15 metacercariae of Centrocestus armatus were detected in 5 gobies (33.3%) from Gyeongpo-ho (ho means lake) in Gangneung-si, Gangwon-do. The present study suggests that yellowfin goby, A. flavimanus, acts as the infection sources of zoonotic intestinal flukes in western and southern coastal areas than in eastern coastal areas of Korea.

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High levels of metacercarial infestation (family: Diplostomidae) do not affect host energetics and swimming performance in the Epaulette goby (Coryogalops sordidus, Gobiidae)
Hendrik D. du Toit, Gavin M. Rishworth, Nadine A. Strydom, Shaun Welman
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Infections with Digenetic Trematode Metacercariae in Freshwater Fishes from Two Visiting Sites of Migratory Birds in Gyeongsangnam-do, Republic of Korea
Woon-Mok Sohn, Byoung-Kuk Na
The Korean Journal of Parasitology.2019; 57(3): 273. CrossRef
Infection Status with Clinostomum complanatum Metacercariae in Fish from Water Systems of Nakdong-gang (River) in Korea
Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho
The Korean Journal of Parasitology.2019; 57(4): 389. CrossRef
Infection Status of Isthmiophora hortensis Metacercariae in Dark Sleepers, Odontobutis Species, from Some Water Systems of the Republic of Korea
Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Jung-Won Ju
The Korean Journal of Parasitology.2018; 56(6): 633. CrossRef

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Freshwater Snail Diversity in Mae Lao Agricultural Basin (Chiang Rai, Thailand) with a Focus on Larval Trematode Infections: Kittichai Chantima, Krittawit Suk-ueng, Mintra Kampan; Korean J Parasitol 2018;56(3):247-257.
Published online June 30, 2018; DOI: https://doi.org/10.3347/kjp.2018.56.3.247

Abstract
PDF

The aim of this study was to conduct a freshwater snail survey in Mae Lao agricultural basin to assess the diversity with a focus on habitat types and their larval trematode infections. Snails were collected and examined in 14 sites of Mae Lao agricultural basin from August 2016 to October 2017. A total of 1,688 snail individuals were collected and classified into 7 families, 8 genera, and 12 species. Snail diversity and habitat types were higher in rice paddies than irrigation canals and streams. The most abundant species was Bithynia siamensis siamensis, representing 54.6% of the sample. Three species of snails act as first intermediate host were found with cercarial infections. They were Filopaludina sumatrensis polygramma, B. s. siamensis, and Melanoides tuberculata. The cercariae were categorized into 7 types; echinostome, monostome, gymnocephalous, virgulate, parapleurolophocercous, pleurolophocercous and megalurous cercariae. Parapleurolophocercous cercariae constituted the most common type of cercariae recovered, contributing 41.2% of all infections in snails. Echinostome metacercariae infections were found in 6 snail species with 7.6% prevalence. In addition, the metacercaria of avian trematode, Thapariella sp. were found in Filopaludina spp. snails and B. funiculata with a prevalence of 0.5%. This is the first report for Thapariella metacercariae in the snail host, B. funiculata, and also confirmed that viviparid and bithyniid snails act as the second intermediate hosts of this trematode. This work will provide new information on the distribution and intermediate host of trematode in this area.

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The prevalence of cercarial infection and development of a duplex PCR for detection of the cercarial stage of Haplorchis taichui and H. pumilio in first intermediate hosts from Chai Nat province, Thailand
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Infection Status with Clonorchis sinensis Metacercariae in Fish from Tamjin-gang (River) in Jeollanam-do, Republic of Korea: Ki-Bok Yoon, Hyun-Cheol Lim, Doo Young Jeon, Sook Park, Shin-Hyeong Cho, Jung-Won Ju, Sung-Shik Shin, Byoung-Kuk Na, Woon-Mok Sohn; Korean J Parasitol 2018;56(2):183-188.
Published online April 30, 2018; DOI: https://doi.org/10.3347/kjp.2018.56.2.183

Abstract
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The present study was performed to investigate the infection status with Clonorchis sinensis metacercariae (CsMc) in fishes from 2 sites, the middle and lower reaches, of Tamjin-gang (River) in Jeollanam-do, the Republic of Korea. Total 1,132 fishes in 22 species were collected from the middle reaches in Jangheung-gun for 4 years (2014-2017) and 517 fishes in 17 species were also collected from the lower reaches in Gangjin-gun in 2014 and 2017. They were all individually examined with the artificial digestion method in our laboratory. CsMc were detected in 322 (28.5%) out of 1,132 fishes from Jangheung-gun, and in 161 (31.1%) out of 517 fishes from Gangjin-gun, and their densities were 51 and 57 per fish infected each. In the fish species with CsMc, positive rates were 61.5% in Jangheung-gun and 62.7% in Gangjin-gun. A total of 222 Pungtungia herzi were examined and they were all infected with CsMc. The average intensity was 103 CsMc in the index fish, P. herzi (95 in Jangheung-gun and 121 in Gangjin-gun). In P. herzi bimonthly examined in 2017, the intensity was commonly most higher in March in 2 surveyed sites, however the significant seasonal endemicity was not showed. Conclusively, it was confirmed that CsMc is more or less prevalent in fishes from Tamjin-gang and their endemicity is higher in fish from the lower reaches in Gangjin-gun than the middle reaches in Jangheung-gun in Jeollanam-do, Korea.

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Zoonotic human liver flukes, a type 1 biocarcinogen, in freshwater fishes: genetic analysis and confirmation of molluscan vectors and reservoir hosts in Bangladesh
Sharmin Shahid Labony, Md. Abdul Alim, Muhammad Mehedi Hasan, Md. Shahadat Hossain, Sharmin Akter, Joydeep Paul, Thahsin Farjana, Md. Haydar Ali, Mohammad Zahangir Alam, Takeshi Hatta, Hayato Kawada, Keiko Mizutani, Naotoshi Tsuji, Anisuzzaman
Infectious Diseases of Poverty.2024;[Epub] CrossRef
Infection Characteristics of Clonorchis sinensis Metacercariae in Fish from Republic of Korea
Woon-Mok Sohn
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Current status of Clonorchis sinensis and clonorchiasis in Korea: epidemiological perspectives integrating the data from human and intermediate hosts
Won Gi Yoo, Woon-Mok Sohn, Byoung-Kuk Na
Parasitology.2022; 149(10): 1296. CrossRef
Survey of Zoonotic Trematode Metacercariae in Fish from Water Systems of Geum-gang (River) in Republic of Korea
Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Cheon-Hyeon Kim, Min-Ah Hwang, Kyeong-Woo No, Jai-Dong Kim
The Korean Journal of Parasitology.2021; 59(1): 23. CrossRef
High Endemicity with Clonorchis sinensis Metacercariae in Fish from Yongjeon-cheon (Stream) in Cheongsong-gun, Gyeongsangbuk-do, Korea
Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Hee Il Lee, Myoung-Ro Lee, Jung-Won Ju, Gou Ok Kim
The Korean Journal of Parasitology.2021; 59(1): 97. CrossRef
Prevalence and Infection Intensity of Zoonotic Trematode Metacercariae in Fish from Soyang-cheon (Stream), in Wanju-gun, Jeollabuk-do, Korea
Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Jung-Won Ju, Cheon-Hyeon Kim, Min-Ah Hwang, Kyeong-Woo No, Jong-Ho Park
The Korean Journal of Parasitology.2021; 59(3): 265. CrossRef
Novel mechanism of hepatobiliary system damage and immunoglobulin G4 elevation caused by Clonorchis sinensis infection
Xin-He Zhang, Die Huang, Yi-Ling Li, Bing Chang
World Journal of Clinical Cases.2021; 9(23): 6639. CrossRef
Survey of Zoonotic Trematode Metacercariae in Fish from Irrigation Canal of Togyo-jeosuji (Reservoir) in Cheorwon-gun, Gangwon-do, Republic of Korea
Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Hee Il Lee, Jung-Won Ju, Myoung-Ro Lee, Eun-Joo Lim, Sung Yong Son, Eunmi Ko, Jaeseok Choi
The Korean Journal of Parasitology.2021; 59(4): 427. CrossRef
Endemicity of Zoonotic Trematode Metacercariae in Fish from Deokcheon-gang (River) in Sancheong-gun, Gyeongsangnam-do, Republic of Korea
Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Hee Il Lee, Jung-Won Ju, Myoung-Ro Lee, Jeong-Gil Park, Jihee Ahn
The Korean Journal of Parasitology.2021; 59(5): 523. CrossRef
Prevalence of Clonorchis sinensis infection in fish in South‐East Asia: A systematic review and meta‐analysis
Ying Zhang, Qing‐Long Gong, Qing‐Bo Lv, Yang‐Yuan Qiu, Yan‐Chun Wang, Hong‐Yu Qiu, Xin‐Rui Guo, Jun‐Feng Gao, Qiao‐Cheng Chang, Chun‐Ren Wang
Journal of Fish Diseases.2020; 43(11): 1409. CrossRef
Infection Status with Clonorchis sinensis Metacercariae in Fish from Yangcheon (Stream) in Sancheong-gun, Gyeongsangnam-do, Korea
Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Jung-Won Ju
The Korean Journal of Parasitology.2019; 57(2): 145. CrossRef
Infections with Digenetic Trematode Metacercariae in Freshwater Fishes from Two Visiting Sites of Migratory Birds in Gyeongsangnam-do, Republic of Korea
Woon-Mok Sohn, Byoung-Kuk Na
The Korean Journal of Parasitology.2019; 57(3): 273. CrossRef
Infection Status with Clinostomum complanatum Metacercariae in Fish from Water Systems of Nakdong-gang (River) in Korea
Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho
The Korean Journal of Parasitology.2019; 57(4): 389. CrossRef
Infection Status with Digenetic Trematode Metacercariae in Fishes from Coastal Lakes in Gangwon-do, Republic of Korea
Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Soon-Won Lee
The Korean Journal of Parasitology.2019; 57(6): 681. CrossRef
Infection Status with Metagonimus spp. Metacercariae in Fishes from Seomjin-gang and Tamjin-gang in Republic of Korea
Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Jung-Won Ju, Cheon-Hyeon Kim, Ki-Bok Yoon
The Korean Journal of Parasitology.2018; 56(4): 351. CrossRef
Infections with Digenean Trematode Metacercariae in Two Invasive Alien Fish, Micropterus salmoides and Lepomis macrochirus, in Two Rivers in Chungcheongbuk-do, Republic of Korea
Seongjun Choe, Hansol Park, Dongmin Lee, Yeseul Kang, Hyeong-Kyu Jeon, Keeseon S. Eom
The Korean Journal of Parasitology.2018; 56(5): 509. CrossRef

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Prevalence and Intensity of Clonorchis sinensis Metacercariae in Freshwater Fish from Wicheon Stream in Gunwi-gun, Gyeongsangbuk-do, Korea: Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Jung-Won Ju, Dong-Chul Son; Korean J Parasitol 2018;56(1):41-48.
Published online February 28, 2018; DOI: https://doi.org/10.3347/kjp.2018.56.1.41

Abstract
PDF

The infection status of Clonorchis sinensis metacercariae (CsMc) was examined in freshwater fish from a highly prevalent site, Wicheon (a branch of Nakdong-gang), which is located in Gunwi-gun, Gyeongsangbuk-do, the Republic of Korea. Total 1,162 fish in 32 species were examined by the artificial digestion method through 6 years. CsMc were detected in 720 (67.5%) out of 1,067 fish (26 spp.) and their density was 610 per fish infected. In the susceptible gobioninid fish group, i.e., Pungtungia herzi, Squalidus gracilis majimae, Squalidus japonicus coreanus, Sarcocheilichthys variegatus wakiyae and Pseudorasbora parva, all of 323 fish were infected with an average of 1,310 CsMc. Total 23 (95.8%) gobioninid fish, i.e., Pseudogobio esocinus, Abbottina springeri, Hemibarbus longirostris, Microphysogobio koreensis, and Microphysogobio jeoni, were infected with 127 CsMc in average. In the acheilognathinid fish (bitterlings) group, the prevalence was 77.0%, and the density was 50 CsMc per fish infected. In the rasborinid fish (chubs) group, i.e., Zacco platypus, Zacco temminckii, Zacco koreanus, and Opsariichthys uncirostris amurensis, 147 (36.5%) out of 403 fish examined were infected with 15 CsMc in average. The susceptibility indices of CsMc were 412 in the overall positive fish group, 1,310 in the gobioninid group-1, 122 in the gobioninid group-2, 38.5 in the acheilognathinid group, and 5.5 in the rasborinid fish group. Conclusively, it was confirmed that CsMc are highly prevalent in fish from Wicheon, and their infection tendency varied according to the subfamily groups in Cyprinidae fish hosts.

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The Korean Journal of Parasitology.2021; 59(1): 23. CrossRef
Prevalence and Infection Intensity of Zoonotic Trematode Metacercariae in Fish from Soyang-cheon (Stream), in Wanju-gun, Jeollabuk-do, Korea
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The Korean Journal of Parasitology.2021; 59(4): 427. CrossRef
Endemicity of Zoonotic Trematode Metacercariae in Fish from Deokcheon-gang (River) in Sancheong-gun, Gyeongsangnam-do, Republic of Korea
Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Hee Il Lee, Jung-Won Ju, Myoung-Ro Lee, Jeong-Gil Park, Jihee Ahn
The Korean Journal of Parasitology.2021; 59(5): 523. CrossRef
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Infection Status with Clinostomum complanatum Metacercariae in Fish from Water Systems of Nakdong-gang (River) in Korea
Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho
The Korean Journal of Parasitology.2019; 57(4): 389. CrossRef
Infection Status with Clonorchis sinensis Metacercariae in Fish from Tamjin-gang (River) in Jeollanam-do, Republic of Korea
Ki-Bok Yoon, Hyun-Cheol Lim, Doo Young Jeon, Sook Park, Shin-Hyeong Cho, Jung-Won Ju, Sung-Shik Shin, Byoung-Kuk Na, Woon-Mok Sohn
The Korean Journal of Parasitology.2018; 56(2): 183. CrossRef
Infections with Digenean Trematode Metacercariae in Two Invasive Alien Fish, Micropterus salmoides and Lepomis macrochirus, in Two Rivers in Chungcheongbuk-do, Republic of Korea
Seongjun Choe, Hansol Park, Dongmin Lee, Yeseul Kang, Hyeong-Kyu Jeon, Keeseon S. Eom
The Korean Journal of Parasitology.2018; 56(5): 509. CrossRef

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Molecular and Biochemical Characterization of Opisthorchis viverrini Calreticulin: Wanlapa Chaibangyang, Amornrat Geadkaew-Krenc, Suksiri Vichasri-Grams, Smarn Tesana, Rudi Grams; Korean J Parasitol 2017;55(6):643-652.
Published online December 31, 2017; DOI: https://doi.org/10.3347/kjp.2017.55.6.643

Abstract
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Calreticulin (CALR), a multifunctional protein thoroughly researched in mammals, comprises N-, P-, and C-domain and has roles in calcium homeostasis, chaperoning, clearance of apoptotic cells, cell adhesion, and also angiogenesis. In this study, the spatial and temporal expression patterns of the Opisthorchis viverrini CALR gene were analyzed, and calcium-binding and chaperoning properties of recombinant O. viverrini CALR (OvCALR) investigated. OvCALR mRNA was detected from the newly excysted juvenile to the mature parasite by RT-PCR while specific antibodies showed a wide distribution of the protein. OvCALR was localized in tegumental cell bodies, testes, ovary, eggs, Mehlis’ gland, prostate gland, and vitelline cells of the mature parasite. Recombinant OvCALR showed an in vitro suppressive effect on the thermal aggregation of citrate synthase. The recombinant OvCALR C-domain showed a mobility shift in native gel electrophoresis in the presence of calcium. The results imply that OvCALR has comparable function to the mammalian homolog as a calcium-binding molecular chaperone. Inferred from the observed strong immunostaining of the reproductive tissues, OvCALR should be important for reproduction and might be an interesting target to disrupt parasite fecundity. Transacetylase activity of OvCALR as reported for calreticulin of Haemonchus contortus could not be observed.

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Recombinant Toxoplasma gondii Calreticulin protein provides partial protection against acute and chronic toxoplasmosis
Jing Zhang, Zhenke Yang, Hangbin Ma, Xiaowei Tian, Jiani Li, Zihang Zhang, Longxin Yang, Mengchuang Feng, Xuefang Mei, Zhenchao Zhang, Xingrui Li, Shuai Wang
Acta Tropica.2023; 241: 106883. CrossRef
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Diego Esperante, Ana Flisser, Fela Mendlovic
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Galia Ramírez-Toloza, Eduardo Sosoniuk-Roche, Carolina Valck, Lorena Aguilar-Guzmán, Viviana P. Ferreira, Arturo Ferreira
Trends in Parasitology.2020; 36(4): 368. CrossRef
The Interactions of Parasite Calreticulin With Initial Complement Components: Consequences in Immunity and Virulence
Galia Ramírez-Toloza, Lorena Aguilar-Guzmán, Carolina Valck, Viviana P. Ferreira, Arturo Ferreira
Frontiers in Immunology.2020;[Epub] CrossRef
Diallyl disulfide down‐regulates calreticulin and promotes C/EBPα expression in differentiation of human leukaemia cells
Jing Sun, Hongxiang Mu, Jia Yu, Linwei Li, Hongxia Yan, Guoqing Li, Hui Tan, Nanyang Yang, Xiaoyan Yang, Lan Yi
Journal of Cellular and Molecular Medicine.2019; 23(1): 194. CrossRef
Evaluation of Opisthorchis viverrini calreticulin for potential host modulation
Wanlapa Chaibangyang, Amornrat Geadkaew-Krenc, Peter M. Smooker, Smarn Tesana, Rudi Grams
Acta Tropica.2018; 187: 175. CrossRef

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Zoonotic Trematode Metacercariae in Fish from Yangon, Myanmar and Their Adults Recovered from Experimental Animals: Jong-Yil Chai, Woon-Mok Sohn, Byoung-Kuk Na, Jong-Bok Park, Hoo-Gn Jeoung, Eui-Hyug Hoang, Thi Thi Htoon, Htay Htay Tin; Korean J Parasitol 2017;55(6):631-641.
Published online December 31, 2017; DOI: https://doi.org/10.3347/kjp.2017.55.6.631

Abstract
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A survey was performed to investigate the infection status of zoonotic trematode (ZT) metacercariae in fish from a local market in Yangon City, Myanmar. A total of 264 fish (12 species) were collected through 4 times from December 2013 to June 2015. All collected fish were transferred to our laboratory on ice and examined by the artificial digestion
method
. More than 7 species of ZT metacercariae, i.e., Haplorchis taichui, H. pumilio, H. yokogawai, Centrocestus spp., Stellantchasmus falcatus, Pygidiopsis cambodiensis, and Procerovum sp. were detected. Metacercariae of H. taichui were collected in 58 (42.3%) out of 137 fish (5 species), and their average density was 42.9 per fish infected. Metacercariae of H. pumilio were detected in 96 (49.0%) out of 196 fish (9 species), and their average density was 23.6 per fish infected. H. yokogawai metacercariae were found in 40 (50.0%) out of 80 fish (5 species), and Centrocestus spp. metacercariae in 91 (50.8%) out of 179 fish (8 species), and their densities were 306 and 25.8 per fish infected, respectively. Metacercariae of S. falcatus and P. cambodiensis were detected only in mullets, Chelon macrolepis. A total of 280 Procerovum sp. metacercariae were found in 6 out of 12 climbing perch, Anabas testudineus. Morphological characteristics of adult flukes recovered from experimental animals were described. It has been first confirmed that fish from Yangon, Myanmar are commonly infected with various species of ZT metacercariae.

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Laddawan Patarwut, Thapana Chontananarth, Jong-Yil Chai, Watchariya Purivirojkul
The Korean Journal of Parasitology.2020; 58(1): 27. CrossRef
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International Journal of Environmental Research and Public Health.2020; 17(11): 4108. CrossRef
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Fuhong Dai, Sung-Jong Hong, Jhang Ho Pak, Thanh Hoa Le, Seung-Ho Choi, Byoung-Kuk Na, Woon-Mok Sohn
The Korean Journal of Parasitology.2020; 58(3): 333. CrossRef
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Jong-Yil Chai, Bong-Kwang Jung, Keon Hoon Lee, Jin-Youp Ryu, Hyeon-Seung Kim, Sung-Jong Hong, Thi Thi Htoon, Htay Htay Tin, Byoung-Kuk Na, Woon-Mok Sohn
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Echinostoma macrorchis (Digenea: Echinostomatidae): Metacercariae in Cipangopaludina chinensis malleata Snails and Adults from Experimental Rats in Korea: Woon-Mok Sohn, Byoung-Kuk Na; Korean J Parasitol 2017;55(5):541-548.
Published online October 31, 2017; DOI: https://doi.org/10.3347/kjp.2017.55.5.541

Abstract
PDF

A survey was performed to know the infection status of echinostome metacercariae in Cipangopaludina chinensis malleata snails from Korea. Total 75 snails collected in 5 localities, i.e., Imsil-gun, Jeollabuk-do, Hwasun-gun and Shinan-gun (Aphae and Jido), Jeollanam-do, and Jinju-si, Gyeongsangnam-do, were examined for metacercariae by the artificial digestion method. Infection rates of metacercariae were 80.0%, 66.7%, 100%, 60.0%, and 73.3%, and their densities were 39, 32, 183, 19, and 30 per snail infected, respectively. The metacercariae were round, 105-118×105-118 μm in size, with a thin cyst wall, collar spines on the head collar, and excretory granules in 2 canals of excretory tube. Adult flukes were elongated, ventrally curved, and 5,167×939 μm in average size. Head collar distinct, bearing 45 collar spines with 5 end groups on each side. Oral sucker subterminal, pharynx well developed, and esophagus somewhat short. Cirrus sac well developed, with a saccular seminal vesicle, and ventral sucker very large. Ovary elliptical and on the median line of the body. Testes tandem and slightly lobed. Eggs operculated, elliptical, and 90-103×55-60 μm in size. By scanning electron microscopy, the head collar was prominent with 45 collar spines resembling horns of younger stags. Scale-like tegumental spines were densely distributed on the body surface between the head collar and ventral sucker. Conclusively, it has been first confirmed that the life cycle of E. macrorchis is indigenously maintained in Korea, and C. chinensis malleata snails are popularly infected with the metacercariae of this echinostome.

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Molecular and phylogenetic analysis and risk assessment of a trematode parasite, Artyfechinostomum sufrartyfex Lane, 1915 with a new host record from India
Dimple Mandla, Neena Singla, Sukhmanpreet Kaur Brar, Lachhman Das Singla
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Echinostoma aegyptica (Trematoda: Echinostomatidae) Infection in Five Riparian People in Savannakhet Province, Lao PDR
Jong-Yil Chai, Bong-Kwang Jung, Taehee Chang, Hyejoo Shin, Woon-Mok Sohn, Keeseon S. Eom, Tai-Soon Yong, Duk-Young Min, Bounlay Phammasack, Bounnaloth Insisiengmay, Han-Jong Rim
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Snail-borne zoonotic trematodes in edible viviparid snails obtained from wet markets in Northern Thailand
K. Chantima, C. Rika
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Echinostoma macrorchis Metacercariae in Cipangopaludina chinensis malleata from Xiengkhuang Province, Lao PDR and Morphologies of Adults from Experimental Animals
Woon-Mok Sohn, Byoung-Kuk Na, Dongmin Lee, Keeseon S. Eom, Tai-Soon Yong, Jong-Yil Chai, Duk-Young Min
The Korean Journal of Parasitology.2019; 57(6): 657. CrossRef

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Suppressors for Human Epidermal Growth Factor Receptor 2/4 (HER2/4): A New Family of Anti-Toxoplasmic Agents in ARPE-19 Cells: Yeong Hoon Kim, Lokraj Bhatt, Hye-Jin Ahn, Zhaoshou Yang, Won-Kyu Lee, Ho-Woo Nam; Korean J Parasitol 2017;55(5):491-503.
Published online October 31, 2017; DOI: https://doi.org/10.3347/kjp.2017.55.5.491

Abstract
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The effects of tyrosine kinase inhibitors (TKIs) were evaluated on growth inhibition of intracellular Toxoplasma gondii in host ARPE-19 cells. The number of tachyzoites per parasitophorous vacuolar membrane (PVM) was counted after treatment with TKIs. T. gondii protein expression was assessed by western blot. Immunofluorescence assay was performed using Programmed Cell Death 4 (PDCD4) and T. gondii GRA3 antibodies. The TKIs were divided into 3 groups; non-epidermal growth factor receptor (non-EGFR), anti-human EGFR 2 (anti-HER2), and anti-HER2/4 TKIs, respectively. Group I TKIs (nintedanib, AZD9291, and sunitinib) were unable to inhibit proliferation without destroying host cells. Group II TKIs (lapatinib, gefitinib, erlotinib, and AG1478) inhibited proliferation up to 98% equivalent to control pyrimethamine (5 ?M) at 20 μM and higher, without affecting host cells. Group III TKIs (neratinib, dacomitinib, afatinib, and pelitinib) inhibited proliferation up to 98% equivalent to pyrimethamine at 1-5 μM, but host cells were destroyed at 10-20 ?M. In Group I, TgHSP90 and SAG1 inhibitions were weak, and GRA3 expression was moderately inhibited. In Group II, TgHSP90 and SAG1 expressions seemed to be slightly enhanced, while GRA3 showed none to mild inhibition; however, AG1478 inhibited all proteins moderately. Protein expression was blocked in Group III, comparable to pyrimethamine. PDCD4 and GRA3 were well localized inside the nuclei in Group I, mildly disrupted in Group II, and were completely disrupted in Group III. This study suggests the possibility of a vital T. gondii TK having potential HER2/4 properties, thus anti-HER2/4 TKIs may inhibit intracellular parasite proliferation with minimal adverse effects on host cells.

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Genetic Diversity and Natural Selection in 42 kDa Region of Plasmodium vivax Merozoite Surface Protein-1 from China-Myanmar Endemic Border: Xia Zhou, Ernest Tambo, Jing Su, Qiang Fang, Wei Ruan, Jun-Hu Chen, Ming-Bo Yin, Xiao-Nong Zhou; Korean J Parasitol 2017;55(5):473-480.
Published online October 31, 2017; DOI: https://doi.org/10.3347/kjp.2017.55.5.473

Plasmodium vivax merozoite surface protein-1 (PvMSP1) gene codes for a major malaria vaccine candidate antigen. However, its polymorphic nature represents an obstacle to the design of a protective vaccine. In this study, we analyzed the genetic polymorphism and natural selection of the C-terminal 42 kDa fragment within PvMSP1 gene (Pv MSP1₄₂) from 77 P. vivax isolates, collected from imported cases of China-Myanmar border (CMB) areas in Yunnan province and the inland cases from Anhui, Yunnan, and Zhejiang province in China during 2009-2012. Totally, 41 haplotypes were identified and 30 of them were new haplotypes. The differences between the rates of non-synonymous and synonymous mutations suggest that PvMSP1₄₂ has evolved under natural selection, and a high selective pressure preferentially acted on regions identified of PvMSP1₃₃. Our results also demonstrated that PvMSP1₄₂ of P. vivax isolates collected on China-Myanmar border areas display higher genetic polymorphisms than those collected from inland of China. Such results have significant implications for understanding the dynamic of the P. vivax population and may be useful information towards China malaria elimination campaign strategies.

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Parsakorn Tapaopong, Gustavo da Silva, Sittinont Chainarin, Chayanut Suansomjit, Khajohnpong Manopwisedjaroen, Liwang Cui, Cristian Koepfli, Jetsumon Sattabongkot, Wang Nguitragool
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Alejandro Flores-Alanis, Lilia González-Cerón, Frida Santillán-Valenzuela, Cecilia Ximenez, Marco A. Sandoval-Bautista, Rene Cerritos
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Brief Communications

Recent Incidence of Paragonimus westermani Metacercariae in Freshwater Crayfish, Cambaroides similis, from Two Enzootic Sites in Jeollanam-do, Korea: Jin-Ho Song, Fuhong Dai, Xuelian Bai, Tae-Im Kim, Hyun-Jong Yang, Tong-Soo Kim, Shin-Hyung Cho, Sung-Jong Hong; Korean J Parasitol 2017;55(3):347-350.
Published online June 30, 2017; DOI: https://doi.org/10.3347/kjp.2017.55.3.347

Abstract
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An epidemiological study was performed to know the recent infection status of Paragonimus westermani metacercariae (PwMc) in freshwater crayfish, Cambaroides similis, from 2 streams in Jeollanam-do, Republic of Korea. Crayfish were collected from creeks in Bogil-do (Island), Wando-gun, and in a creek near Daeheung Temple in Haenam-gun. The infection rate of crayfish with PwMc in Bogil-do was 89.8%, and the metacercarial burden was 37 PwMc per the infected crayfish. Crayfish in a creek near Daeheung Temple were larger and twice heavier than those in Bogil-do. Of them, 96.5% were infected with PwMc. An average of 140 metacercariae was found in the infected crayfish, almost quadruple to those of Bogil-do. There was a strong correlation between the number of PwMc and body weight of the crayfish. These results suggest that P. westermani metacercariae are still prevalent in crayfish of the 2 regions in Jeollanam-do, Korea.

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Physical habitat characteristics of freshwater crayfish Cambaroides similis (Koelbel, 1892) (Arthropoda, Decapoda) in South Korea
Jin-Young Kim, Yong Ju Kwon, Ye Ji Kim, Yeong-Deok Han, Jung Soo Han, Chae Hui An, Yong Su Park, Dongsoo Kong
Journal of Ecology and Environment.2023;[Epub] CrossRef
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Qiu-Hong Shu, Shu-De Li, Ming Tian, Yong Meng, Shu-Mei-Qi He, Min Zhu, Miao-Miao Wang, Wen-Lin Wang
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Artyfechinostomum malayanum: Metacercariae Encysted in Pila sp. Snails Purchased from Phnom Penh, Cambodia: Woon-Mok Sohn, Tai-Soon Yong, Keeseon S. Eom, Muth Sinuon, Hoo-Gn Jeoung, Jong-Yil Chai; Korean J Parasitol 2017;55(3):341-345.
Published online June 30, 2017; DOI: https://doi.org/10.3347/kjp.2017.55.3.341

Abstract
PDF

The metacercariae of Artyfechinostomum malayanum (Leiper, 1911) Mendheim, 1943 were discovered in Pila sp. snails purchased from a market in Phnom Penh, Cambodia. They were isolated from the snails using the artificial digestion technique and were orally fed to 2 hamsters, 1 rat, and 2 mice to obtain the adult flukes. The metacercariae were round, 145-165 μm in diameter, having a cyst wall of 6-10 μm in thickness, a head collar and collar spines, and characteristic features of excretory granules. Adult flukes were recovered in the small intestines of the animals at days 14 and 32 post infection and were morphologically observed using a light microscope and a scanning electron microscope. They were plump or elongated, ventrally curved, 6.0-8.1×1.6-2.0 mm in size, and characterized by the head collar bearing 43 collar spines, including 5 end group ones on each side, a long cirrus sac extending beyond the posterior margin of the ventral sucker, a submedian ovary, and 2 deeply lobed testes. Eggs in uteri were operculate, ovoid to ellipsoid, and 120-135×68-75 μm in size. In scanning electron microscopy, the head collar was prominent with collar spines looking like horns. Scale-like tegumental spines were densely distributed on the ventral surface between the head collar and ventral sucker. Sensory papillae were distributed mainly on the tegument around suckers. By this study, it has been first confirmed that the life cycle of A. malayanum exists in Cambodia.

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Biological Hazards and Indicators Found in Products of Animal Origin in Cambodia from 2000 to 2022: A Systematic Review
Shwe Phue San, Rortana Chea, Delia Grace, Kristina Roesel, Sothyra Tum, Stephen Young, Tumnoon Charaslertrangsi, Nazanin Zand, Shetty Seetharama Thombathu, Ra Thorng, Leab Kong, Kuok Fidero, Linda Nicolaides
International Journal of Environmental Research and Public Health.2024; 21(12): 1621. CrossRef
Mitophylogenomics of the zoonotic fluke Echinostoma malayanum confirms it as a member of the genus Artyfechinostomum Lane, 1915 and illustrates the complexity of Echinostomatidae systematics
Linh Thi Khanh Pham, Weerachai Saijuntha, Scott P. Lawton, Thanh Hoa Le
Parasitology Research.2022; 121(3): 899. CrossRef
High diversity of trematode metacercariae that parasitize freshwater gastropods in Bangkok, Thailand, and their infective situations, morphologies and phylogenetic relationships
Pichit Wiroonpan, Thapana Chontananarth, Jong-Yil Chai, Watchariya Purivirojkul
Parasitology.2022; 149(7): 913. CrossRef
General overview of the current status of human foodborne trematodiasis
Jong-Yil Chai, Bong-Kwang Jung
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Foodborne intestinal flukes: A brief review of epidemiology and geographical distribution
Jong-Yil Chai, Bong-Kwang Jung
Acta Tropica.2020; 201: 105210. CrossRef

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PCR Identification and Phylogenetic Analysis of Trichomonas gallinae from Domestic Pigeons in Guangzhou, China: Shen-Ben Qiu, Meng-Na Lv, Xi He, Ya-Biao Weng, Shang-Shu Zou, Xin-Qiu Wang, Rui-Qing Lin; Korean J Parasitol 2017;55(3):333-336.
Published online June 30, 2017; DOI: https://doi.org/10.3347/kjp.2017.55.3.333

Abstract
PDF

Avian trichomoniasis caused by Trichomonas gallinae is a serious protozoan disease worldwide. The domestic pigeon (Columba livia domestica) is the main host for T. gallinae and plays an important role in the spread of the disease. Based on the internal transcribed spacers of nuclear ribosomal DNA of this parasite, a pair of primers (TgF2/TgR2) was designed and used to develop a PCR assay for the diagnosis of T. gallinae infection in domestic pigeons. This approach allowed the identification of T. gallinae, and no amplicons were produced when using DNA from other common avian pathogens. The minimum amount of DNA detectable by the specific PCR assay developed in this study was 15 pg. Clinical samples from Guangzhou, China, were examined using this PCR assay and a standard microscopy method, and their molecular characteristics were determined by phylogenetic analysis. All of the T. gallinae-positive samples detected by microscopic examination were also detected as positive by the PCR assay. Most of the samples identified as negative by microscopic examination were detected as T. gallinae positive by the PCR assay and were confirmed by sequencing. The positive samples of T. gallinae collected from Guangzhou, China, were identified as T. gallinae genotype B by sequencing and phylogenetic analyses, providing relevant data for studying the ecology and population genetic structures of trichomonads and for the prevention and control of the diseases they cause.

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Original Article

Prevalence of Clonorchis sinensis Metacercariae in Fish from Water Systems of Seomjin-gang (River): Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Mi-Yeoun Park, Cheon-Hyeon Kim, Min-Ah Hwang, Kyeong-Woo No, Ki-Bok Yoon, Hyun-Cheol Lim; Korean J Parasitol 2017;55(3):305-312.
Published online June 30, 2017; DOI: https://doi.org/10.3347/kjp.2017.55.3.305

Abstract
PDF

The prevalence of Clonorchis sinensis metacercariae (CsMc) was examined in freshwater fish from the water systems of Seomjin-gang (River), the Republic of Korea. Total 1,604 fish from 7 local sites of Seomjin-gang were examined by artificial digestion methods. The metacercariae of C. sinensis were detected in 102 (39.8%) out of 256 fish (14 species) from the upper reaches of Seomjin-gang, i.e., Osucheon (22.3% in 6 fish species) in Imsil-gun, and Seomjin-gang (63.9% in 9 fish species) in Sunchang-gun, Jeollabuk-do. Their average density was 9.0 per infected fish. They were also found in 132 (48.0%) out of 275 fish (12 spp.) from the middle reaches of Seomjin-gang, i.e., Songdaecheon (58.9% in 4 fish species) in Namwon-si, Jeollabuk-do, and Seomjin-gang (45.2% in 10 fish species) in Gokseong-gun, Jeollanam-do. Their average density was 21.0 per infected fish. CsMc were detected in 77 (56.6%) out of 136 fish (11 species) from the lower reaches of Seomjin-gang, i.e., Seomjin-gang (73.3% in 11 fish species) in Gurye-gun, Jeollanam-do, and Namsancheon (8.6% in 1 fish species) in Hadong-gun, Gyeongsangnam-do. Their average density was 64.9 per infected fish. The metacercariae of Metorchis orientalis were also detected in 6 fish species from 4 sites of Seomjin-gang. Conclusively, it has been confirmed that CsMc are more or less prevalent in fish from some water systems of Seomjin-gang in Korea.

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Re‐evaluation of certain aspects of the EFSA Scientific Opinion of April 2010 on risk assessment of parasites in fishery products, based on new scientific data. Part 2
Ana Allende, Avelino Alvarez‐Ordóñez, Valeria Bortolaia, Sara Bover‐Cid, Alessandra De Cesare, Wietske Dohmen, Laurent Guillier, Lieve Herman, Liesbeth Jacxsens, Maarten Nauta, Lapo Mughini‐Gras, Jakob Ottoson, Luisa Peixe, Fernando Perez‐Rodriguez, Panag
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Infection Characteristics of Clonorchis sinensis Metacercariae in Fish from Republic of Korea
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The Korean Journal of Parasitology.2022; 60(2): 79. CrossRef
Current status of Clonorchis sinensis and clonorchiasis in Korea: epidemiological perspectives integrating the data from human and intermediate hosts
Won Gi Yoo, Woon-Mok Sohn, Byoung-Kuk Na
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Survey of Zoonotic Trematode Metacercariae in Fish from Water Systems of Geum-gang (River) in Republic of Korea
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The Korean Journal of Parasitology.2021; 59(1): 23. CrossRef
High Endemicity with Clonorchis sinensis Metacercariae in Fish from Yongjeon-cheon (Stream) in Cheongsong-gun, Gyeongsangbuk-do, Korea
Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Hee Il Lee, Myoung-Ro Lee, Jung-Won Ju, Gou Ok Kim
The Korean Journal of Parasitology.2021; 59(1): 97. CrossRef
Prevalence and Infection Intensity of Zoonotic Trematode Metacercariae in Fish from Soyang-cheon (Stream), in Wanju-gun, Jeollabuk-do, Korea
Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Jung-Won Ju, Cheon-Hyeon Kim, Min-Ah Hwang, Kyeong-Woo No, Jong-Ho Park
The Korean Journal of Parasitology.2021; 59(3): 265. CrossRef
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Brief Communication

Stellantchasmus falcatus (Digenea: Heterophyidae) in Cambodia: Discovery of Metacercariae in Mullets and Recovery of Adult Flukes in an Experimental Hamster: Jong-Yil Chai, Woon-Mok Sohn, Byoung-Kuk Na, Hoo-Gn Jeoung, Muth Sinuon, Duong Socheat; Korean J Parasitol 2016;54(4):537-541.
Published online August 31, 2016; DOI: https://doi.org/10.3347/kjp.2016.54.4.537

Abstract
PDF

Stellantchasmus falcatus (Digenea: Heterophyidae) is first reported from Cambodia through recovery of the metacercariae from mullet fish and adult flukes from an experimentally infected hamster. We purchased 7 mullets, Chelon macrolepis, in a local market of Phnom Penh, Cambodia, and each of them was examined by the artificial digestion method on May 2010. The metacercariae of S. falcatus were detected in all mullets (100%) examined, and their average density was 177 per fish. They were elliptical, 220×168 μm in average size. They were orally infected to an hamster to obtain adult flukes. Adults recovered at day 10 post infection were observed with a light microscope and a scanning electron microscope (SEM). They were small, 450×237 μm in average size, had a small oral sucker (41×50 μm), subglobular pharynx (29×21 μm), slender esophagus (57 μm), long and thick-walled expulsor (119×32 μm), spherical ovary (58×69 μm), and 2 ovoid testes (right: 117×74 μm; left: 114×63 μm). Eggs were small, yellow, and 23×12 μm in average size. In SEM observations, tegumental spines were densely distributed on the whole tegument, and single small type I sensory papillae were distributed around the lip of oral sucker. The small ventral sucker was dextrally located and had 8 type I sensory papillae on the left margin. It has been first confirmed in the present study that the mullet, C. macrolepis, is playing the role of a second intermediate host of S. falcatus in Cambodia.

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Original Articles

Pygidiopsis summa (Digenea: Heterophyidae): Status of Metacercarial Infection in Mullets from Coastal Areas in the Republic of Korea: Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Won-Ja Lee, Mi-Yeoun Park, Soon-Won Lee, Seung-Bong Choi, Beom-Nyung Huh, Won-Seok Seok; Korean J Parasitol 2016;54(4):497-502.
Published online August 31, 2016; DOI: https://doi.org/10.3347/kjp.2016.54.4.497

Abstract
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To know the infection status of zoonotic trematode metacercariae in brackish water fish, we surveyed mullets collected from 18 coastal areas in the Republic of Korea. The metacercariae of Pygidiopsis summa were detected in 236 (68.2%) out of 346 mullets examined. They were found in mullets from 15 areas except for those from Boseong-gun (Jeollanam-do), Pohang-si, and Uljin-gun (Gyeongsangbuk-do). Especially in mullets from Taean-gun (Chungcheongnam-do) and Geoje-si (Gyeongsangnam-do), their prevalences were 100% and 95.5%, and the average metacercarial density was more than 1,000 per fish. They were also detected in mullets from 3 coastal lakes, Gyeongpoho, Songjiho, and Hwajinpoho, in Gangwon-do, and their average densities were 419, 147, and 672 per infected fish, respectively. The metacercariae of 5 other heterophyid species, including Heterophyes nocens, Heterophyopsis continua, Metagonimus sp., Stictodora fuscata, and Stictodora lari, were found in the mullets examined. The metacercariae of H. nocens were detected in 66.7, 100, 28.6, 81.6, 3.9, 61.5, and 27.3% of mullets from Muan-gun, Shinan-gun, Haenam-gun, Gangjin-gun, and Boseong-gun (Jeollanam-do), Hadong-gun, and Geoje-si (Gyeongsangnam-do), and their metacercarial intensities were 64, 84, 119, 99, 1, 24, and 24 per fish infected, respectively. From the above results, it has been confirmed that P. summa metacercariae are heavily infected in mullets from coastal areas of Korea. It is suggested that residents who frequently consume raw mullet dish can be easily infected with heterophyid flukes.

Citations

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Infection Status with Digenetic Trematode Metacercariae in Fishes from Coastal Lakes in Gangwon-do, Republic of Korea
Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Soon-Won Lee
The Korean Journal of Parasitology.2019; 57(6): 681. CrossRef
Infections with Zoonotic Trematode Metacercariae in Yellowfin Goby, Acanthogobius flavimanus, from Coastal Areas of Republic of Korea
Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Jung-Won Ju, Soon-Won Lee, Won-Seok Seok
The Korean Journal of Parasitology.2018; 56(3): 259. CrossRef
Fishborne zoonotic heterophyid infections: An update
Jong-Yil Chai, Bong-Kwang Jung
Food and Waterborne Parasitology.2017; 8-9: 33. CrossRef

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138 Download
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Characterization of Pv92, a Novel Merozoite Surface Protein of Plasmodium vivax: Seong-Kyun Lee, Bo Wang, Jin-Hee Han, Myat Htut Nyunt, Fauzi Muh, Patchanee Chootong, Kwon-Soo Ha, Won Sun Park, Seok-Ho Hong, Jeong-Hyun Park, Eun-Taek Han; Korean J Parasitol 2016;54(4):385-391.
Published online August 31, 2016; DOI: https://doi.org/10.3347/kjp.2016.54.4.385

Abstract
PDF

The discovery and understanding of antigenic proteins are essential for development of a vaccine against malaria. In Plasmodium falciparum, Pf92 have been characterized as a merozoite surface protein, and this protein is expressed at the late schizont stage, but no study of Pv92, the orthologue of Pf92 in P. vivax, has been reported. Thus, the protein structure of Pv92 was analyzed, and the gene sequence was aligned with that of other Plasmodium spp. using bioinformatics tools. The recombinant Pv92 protein was expressed and purified using bacterial expression system and used for immunization of mice to gain the polyclonal antibody and for evaluation of antigenicity by protein array. Also, the antibody against Pv92 was used for subcellular analysis by immunofluorescence assay. The Pv92 protein has a signal peptide and a sexual stage s48/45 domain, and the cysteine residues at the N-terminal of Pv92 were completely conserved. The N-terminal of Pv92 was successfully expressed as soluble form using a bacterial expression system. The antibody raised against Pv92 recognized the parasites and completely merged with PvMSP1-19, indicating that Pv92 was localized on the merozoite surface. Evaluation of the human humoral immune response to Pv92 indicated moderate antigenicity, with 65% sensitivity and 95% specificity by protein array. Taken together, the merozoite surface localization and antigenicity of Pv92 implicate that it might be involved in attachment and invasion of a merozoite to a new host cell or immune evasion during invasion process.

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Malaria Journal.2018;[Epub] CrossRef