Parasites, Hosts and Diseases

"Pygidiopsis summa"

Original Articles

Zoonotic Intestinal Trematodes in Stray Cats (Felis catus) from Riverside Areas of the Republic of Korea: Sung-Shik Shin, Dae-Sung Oh, Kyu-Sung Ahn, Shin-Hyeong Cho, Won-Ja Lee, Byoung-Kuk Na, Woon-Mok Sohn; Korean J Parasitol 2015;53(2):209-213.
Published online April 22, 2015; DOI: https://doi.org/10.3347/kjp.2015.53.2.209

Abstract
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The present study was performed to survey the infection status of zoonotic intestinal trematode (ZIT) in stray cats from 5 major riverside areas in the Republic of Korea. Total 400 stray cats were captured with live-traps in riverside areas of Seomjingang (‘gang’ means river) (203 cats) from June to October 2010, and of Yeongsangang (41), Nakdonggang (57), Geumgang (38), and Hangang (61 cats) from June to October 2011, respectively. Small intestines resected from cats were opened with a pair of scissors in a beaker with 0.85% saline and examined with naked eyes and under a stereomicroscope. More than 16 ZIT species were detected in 188 (92.6%) cats from Seomjingang areas, and the number of worms recovered was 111 per cat infected. In cats from riverside areas of Yeongsangang, Nakdonggang, Geumgang, and Hangang, more than 9, 8, 3, and 5 ZIT species were recovered, and the worm burdens were 13, 42, 11, and 56 specimens per infected cat, respectively. As the members of family Heterophyidae, more than 10 species, i.e., Metagonimus spp., Pygidiopsis summa, Heterophyes nocens, Stellantchasmus falcatus, Heterophyopsis continua, Acanthotrema felis, Centrocestus armatus, Procerovum varium, Cryptocotyle concava, and Stictodora lari, were recovered. More than 5 species of echinostomes, i.e., Echinostoma hortense, Echinochasmus japonicus, Echinochasmus sp., Echinoparyphium sp., and unidentified larval echinostomes, were collected. Plagiorchis spp. were detected in cats from areas of Seomjin-gang and Yeongsangang. From the above results, it has been confirmed that stray cats in 5 major riverside areas of Korea are highly infected with various species of ZITs.

Citations

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Prevalence of parasitic infections in stray cats from Gimpo-si, Gyeonggi-do, Korea
Sooji Hong, Hyejoo Shin, Seungwan Ryoo, Chung-Won Lee, Jae-Young Park, Jong-Yil Chai, Bong-Kwang Jung
Parasites, Hosts and Diseases.2025; 63(2): 182. CrossRef
First Record of Pygidiopsis summa and Ascocotyle longa in Iraq
Ghadeer M. Al-Suwaij, Basim H. Abdullah
Academia Open.2025;[Epub] CrossRef
The Nuclear Ribosomal Transcription Units of Two Echinostomes and Their Taxonomic Implications for the Family Echinostomatidae
Yu Cao, Ye Li, Zhong-Yan Gao, Bo-Tao Jiang
Biology.2025; 14(8): 1101. CrossRef
Global distribution of zoonotic digenetic trematodes: a scoping review
Yue Hu, Rong-Jian Zhan, Shi-Lin Lu, Yi-Yang Zhang, Min-Yu Zhou, Hui Huang, Ding-Ding Wang, Tao Zhang, Zi-Xin Huang, Yun-Fei Zhou, Zhi-Yue Lv
Infectious Diseases of Poverty.2024;[Epub] CrossRef
Prevalence of heterophyid infection in tilapia fish “Orechromas niloticus” with emphasize of cats role as neglected reservoir for zoonotic Heterophyes heterophyes in Egypt
Mahmoud Abdelnaby El-Seify, Khaled Sultan, Nagwa Mohammed Elhawary, Neveen Salah Satour, Naema Mohammed Marey
Journal of Parasitic Diseases.2021; 45(1): 35. CrossRef
Prevalence of endoparasitic and viral infections in client-owned cats in metropolitan Bangkok, Thailand, and the risk factors associated with feline hookworm infections
Wanarit Jitsamai, Nutpiphat Khrutkham, Vachira Hunprasit, Ramaswamy Chandrashekar, Dwight Bowman, Woraporn Sukhumavasi
Veterinary Parasitology: Regional Studies and Reports.2021; 25: 100584. CrossRef
Euryhelmis squamula (Digenea: Heterophyidae) Recovered from Korean Raccoon Dog, Nyctereutes procyonoides koreensis, in Korea
Hyeon Cheol Kim, Eui Ju Hong, Si Yun Ryu, Jinho Park, Jeong Gon Cho, Do Hyeon Yu, Joon Seok Chae, Kyoung Seong Choi, Bae Keun Park
The Korean Journal of Parasitology.2021; 59(3): 303. CrossRef
Intestinal Flukes Recovered from a Herring Gull, Larus argentatus, in the Republic of Korea
Young-Il Lee, Min Seo, Jong-Yil Chai
The Korean Journal of Parasitology.2020; 58(1): 81. CrossRef
Infections of Two Isthmiophora Species (Digenea: Echinostomatidae) in Wild Mammals from Republic of Korea with Their Morphological Descriptions
Seongjun Choe, Ki-Jeong Na, Youngjun Kim, Dong-Hyuk Jeong, Jeong-Jin Yang, Keeseon S. Eom
The Korean Journal of Parasitology.2019; 57(6): 647. CrossRef
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
The Korean Journal of Parasitology.2018; 56(4): 341. 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
Fishborne zoonotic heterophyid infections: An update
Jong-Yil Chai, Bong-Kwang Jung
Food and Waterborne Parasitology.2017; 8-9: 33. CrossRef
New Definitive Hosts and Differential Body Indices of Isthmiophora hortensis (Digenea: Echinostomatidae)
Woon-Mok Sohn, Byoung-Kuk Na, Sung-Shik Shin
The Korean Journal of Parasitology.2017; 55(3): 287. CrossRef

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Mucosal Immune Responses of Mice Experimentally Infected with Pygidiopsis summa (Trematoda: Heterophyidae): Jong-Yil Chai, Young-Jin Park, Jae-Hwan Park, Bong-Kwang Jung, Eun-Hee Shin; Korean J Parasitol 2014;52(1):27-33.
Published online February 19, 2014; DOI: https://doi.org/10.3347/kjp.2014.52.1.27

Abstract
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Mucosal immune responses against Pygidiopsis summa (Trematoda: Heterophyidae) infection were studied in ICR mice. Experimental groups consisted of group 1 (uninfected controls), group 2 (infection with 200 metacercariae), and group 3 (immunosuppression with Depo-Medrol and infection with 200 metacercariae). Worms were recovered in the small intestine at days 1, 3, 5, and 7 post-infection (PI). Intestinal intraepithelial lymphocytes (IEL), mast cells, and goblet cells were counted in intestinal tissue sections stained with Giemsa, astra-blue, and periodic acid-Schiff, respectively. Mucosal IgA levels were measured by ELISA. Expulsion of P. summa from the mouse intestine began to occur from days 3-5 PI which sustained until day 7 PI. The worm expulsion was positively correlated with proliferation of IEL, mast cells, goblet cells, and increase of IgA, although in the case of mast cells significant increase was seen only at day 7 PI. Immunosuppression suppressed all these immune effectors and inhibited worm reduction in the intestine until day 7 PI. The results suggested that various immune effectors which include IEL, goblet cells, mast cells, and IgA play roles in regulating the intestinal mucosal immunity of ICR mice against P. summa infection.

Citations

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Anthelmintic potential of sulphonamides and Cucurbita pepo seeds extract on Heterophyes heterophyes experimentally infected mice
Dalia S. Ashour, Fetouh A. Deyab, Kamal F. Eliwa, Samy I. El-Kowrany
Journal of Parasitic Diseases.2023; 47(4): 697. CrossRef
Intestinal polyparasitism and levels of mucosal anthelmintic SIgA in children from endemic areas in Northeastern Brazil
Luciana M. Oliveira, Yvanna L. D. C. Oliveira, Yrna L. M. Oliveira, Anne Caroline S. Ramos, Gabriela F. Andrade, Vitor L. Sá, Ricardo M. Geraldi, Carina S. Pinheiro, Lilian L. Bueno, Ricardo T. Fujiwara, Silvio S. Dolabella
Parasite Immunology.2022;[Epub] CrossRef
The role of IgA in gastrointestinal helminthiasis: A systematic review
Anne C.S. Ramos, Luciana M. Oliveira, Yvanna L.D.C.O. Santos, Marlon C.S. Dantas, Cristiani I.B. Walker, Ana M.C. Faria, Lílian L. Bueno, Silvio S. Dolabella, Ricardo T. Fujiwara
Immunology Letters.2022; 249: 12. CrossRef
Haplorchis pumilio (Trematoda: Heterophyidae) as a new fish-borne zoonotic agent transmitted by Melanoides tuberculata (Mollusca: Thiaridae) in Brazil: A morphological and molecular study
André S. Lopes, Eduardo A. Pulido-Murillo, Alan L. Melo, Hudson A. Pinto
Infection, Genetics and Evolution.2020; 85: 104495. CrossRef
Fishborne zoonotic heterophyid infections: An update
Jong-Yil Chai, Bong-Kwang Jung
Food and Waterborne Parasitology.2017; 8-9: 33. CrossRef
Pygidiopsis cambodiensis n. sp. (Digenea: Heterophyidae) from experimental hamsters infected with metacercariae in mullets from Cambodia
Woon-Mok Sohn, Deok-Gyu Kim, Bong-Kwang Jung, Jaeeun Cho, Jong-Yil Chai
Parasitology Research.2016; 115(1): 123. CrossRef
Experimental centrocestiasis: Worm burden, morphology and fecundity of Centrocestus formosanus (Trematoda: Heterophyidae) in dexamethasone immunosuppressed mice
Hudson Alves Pinto, Vitor Luís Tenório Mati, Alan Lane de Melo
Parasitology International.2015; 64(5): 236. CrossRef

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Infection Status of Estuarine Fish and Oysters with Intestinal Fluke Metacercariae in Muan-gun, Jeollanam-do, Korea: Shin-Hyeong Cho, In-Sang Kim, Eun-Jung Hwang, Tong-Soo Kim, Byoung-Kuk Na, Woon-Mok Sohn; Korean J Parasitol 2012;50(3):215-220.
Published online August 13, 2012; DOI: https://doi.org/10.3347/kjp.2012.50.3.215

Abstract
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The source of human infection with intestinal flukes was surveyed in estuarine fishes, including the dotted gizzard shad, common sea bass, common blackish goby, redlip mullet, black sea bream, and oyster collected from Muan-gun, Jeollanam-do, Korea during August and September 2007. Collected fishes and oysters were artificially digested in pepsin-HCl solution and examined under a stereomicroscope. In 36 shads (Konosirus punctatus) and 20 basses (Lateolabrax japonicus) examined, Heterophyopsis continua metacercariae were found in 58.3% and 100%, and their average numbers were 12.0 and 6.3 per infected fish, respectively. In 34 gobies (Acanthogobius flavimanus) examined, metacercariae of H. continua were detected in 79.4%, Stictodora lari in 97.1%, and Acanthotrema felis in 92.1%, and their average numbers were 45.8, 189.3, and 235.3 per infected fish, respectively. In 37 redlip mullets (Chelon haematocheilus), Heterophyes nocens metacercariae were found in 56.8%, Pygidiopsis summa in 94.6%, and Stictodora fuscata in 45.9%, and the average metacercarial densities were 17.4, 31.3, and 35.1 per infected fish, respectively. In 30 black sea breams (Acanthopagrus schlegeli) and 45 oysters (Crassostrea gigas) examined, no metacercariae were detected. From the above results, it has been confirmed that the dotted gizzard shad, common sea bass, common blackish goby, and redlip mullet from Muan-gun, Jeollanam-do, Korea are infected with the metacercariae of heterophyid flukes.

Citations

Citations to this article as recorded by

First Record of Pygidiopsis summa and Ascocotyle longa in Iraq
Ghadeer M. Al-Suwaij, Basim H. Abdullah
Academia Open.2025;[Epub] 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
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
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
The Korean Journal of Parasitology.2016; 54(4): 497. CrossRef
Four Human Cases of Acanthotrema felis (Digenea: Heterophyidae) Infection in Korea
Jong-Yil Chai, Jae-Lip Kim, Min Seo
The Korean Journal of Parasitology.2014; 52(3): 291. CrossRef

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Brief Communication

Intestinal Helminth Infections in Feral Cats and a Raccoon Dog on Aphaedo Island, Shinan-gun, with a Special Note on Gymnophalloides seoi Infection in Cats: Eun-Hee Shin, Jae-Hwan Park, Sang-Mee Guk, Jae-Lip Kim, Jong-Yil Chai; Korean J Parasitol 2009;47(2):189-191.
Published online May 26, 2009; DOI: https://doi.org/10.3347/kjp.2009.47.2.189

Abstract
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Four feral cats and a raccoon dog purchased from a local collector on Aphaedo Island, Shinan-gun, where human Gymnophalloides seoi infections are known to be prevalent, were examined for their intestinal helminth parasites. From 2 of 4 cats, a total of 310 adult G. seoi specimens were recovered. Other helminths detected in cats included Heterophyes nocens (1,527 specimens), Pygidiopsis summa (131), Stictodora fuscata (4), Acanthotrema felis (2), Spirometra erinacei (15), toxocarids (4), and a hookworm (1). A raccoon dog was found to be infected with a species of echinostome (55), hookworms (7), toxocarids (3), P. summa (3), and S. erinacei (1). No G. seoi was found in the raccoon dog. The results indicate that feral cats and raccoon dogs on Aphaedo are natural definitive hosts for intestinal trematodes and cestodes, including G. seoi, H. nocens, and S. erinacei. It has been first confirmed that cats, a mammalian species other than humans, play the role of a natural definitive host for G. seoi on Aphaedo Island.

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Heliyon.2024; 10(9): e30059. CrossRef
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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
The Korean Journal of Parasitology.2021; 59(1): 83. CrossRef
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Hyeon Cheol Kim, Eui Ju Hong, Si Yun Ryu, Jinho Park, Jeong Gon Cho, Do Hyeon Yu, Joon Seok Chae, Kyoung Seong Choi, Bae Keun Park
The Korean Journal of Parasitology.2021; 59(3): 303. CrossRef
Cryptocotyle lata (Trematoda: Heterophyidae) Adult from a Korean Raccoon Dog, Nyctereutes procyonoides koreensis
Heon Woo Lee, Eui Ju Hong, Hyeon Cheol Kim, Si Yun Ryu, Bae Keun Park
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Jong-Yil Chai, Bong-Kwang Jung
Acta Tropica.2020; 201: 105210. CrossRef
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Taehee Chang, Bong-Kwang Jung, Hyejoo Shin, Sooji Hong, Jeonggyu Lee, Deok-Gyu Kim, Laddawan Patarwut, Woon-Mok Sohn, Jong-Yil Chai
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Necrotizing Enteritis Caused by Pharyngostomum cordatum Infection in a Stray Cat
Ji-Hyeon Kim, Kyunghyun Lee, Woon-Mok Sohn, Ha-Young Kim, Yu-Ran Lee, Eun-Jin Choi, ByungJae So, Ji-Youl Jung
The Korean Journal of Parasitology.2019; 57(1): 17. CrossRef
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Khaled Mohamed El-Dakhly, Amany Samir Aboshinaf, Asmaa Alaa Kamel
Journal of Parasitic Diseases.2018; 42(4): 646. CrossRef
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Umanets Alexander, Chae-Wong Lim, Bumseok Kim, Eui-Ju Hong, Hyeon-Cheol Kim, Bae-Keun Park
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Jong-Yil Chai, Bong-Kwang Jung
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Quan Liu, Ming-Wei Li, Ze-Dong Wang, Guang-Hui Zhao, Xing-Quan Zhu
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Jong-Yil Chai, Jae-Lip Kim, Min Seo
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Trematodes Recovered in the Small Intestine of Stray Cats in the Republic of Korea
Jong-Yil Chai, Young Yil Bahk, Woon-Mok Sohn
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Journal of Zoo and Wildlife Medicine.2012; 43(3): 682. CrossRef
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Original Articles

Prevalence of Zoonotic Metacercariae in Two Species of Grouper, Epinephelus coioides and Epinephelus bleekeri, and Flathead Mullet, Mugil cephalus, in Vietnam: Dung The Vo, Darwin Murrell, Anders Dalsgaard, Glenn Bristow, Dung Huu Nguyen, Thanh Ngoc Bui, Dung Thi Vo; Korean J Parasitol 2008;46(2):77-82.
Published online June 20, 2008; DOI: https://doi.org/10.3347/kjp.2008.46.2.77

Abstract
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Fishborne zoonotic metacercariae have not been reported from brackish water and marine fish from Vietnam waters although these parasites are common in the country's freshwater fish. Both wild-caught and cultured grouper (Epinephelus coioides and Epinephelus bleekeri), and mullet (Mugil cephalus) from brackish and marine waters located in Khanh Hoa province in central coastal Vietnam were examined, and found positive for zoonotic trematode metacercariae. From grouper, Heterophyopsis continua and Procerovum varium were recovered. The prevalence of H. continua ranged from 2.0 to 6.0% and that for P. varium ranged from 11.6 to 15.8%. Mullet were infected with Pygidiopsis summa and H. continua; both of these species are new records for Vietnam. The prevalence of P. summa in mullet was generally high, ranging from 17.6 to 75.5%, and was significantly higher than the prevalence of H. continua (2.5 to 32.4%). There were no significant differences in the prevalence of metacercariae between grouper from natural or cultured habitats, indicating that the highest risk of infection occurs in the wild-caught state prior to their placement in culture. Further, there was no difference in metacercarial prevalence between the 2 species of grouper. Infected wild-caught seed were only observed from January to October. Monthly variation in prevalence suggests seasonal variation in mullet infections occurs in this region with the highest transmission taking place from October to December. Basic investigations on the ecology and epidemiology of these intestinal flukes need to be carried out to determine their significance as a public health problem and the aspects of their biology that may be vulnerable to control interventions.

Citations

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First Record of Pygidiopsis summa and Ascocotyle longa in Iraq
Ghadeer M. Al-Suwaij, Basim H. Abdullah
Academia Open.2025;[Epub] CrossRef
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Foodborne intestinal flukes: A brief review of epidemiology and geographical distribution
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Acta Tropica.2020; 201: 105210. CrossRef
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Jiaxin Liu, Qiwei Qin, Xinyue Zhang, Chen Li, Yepin Yu, Xiaohong Huang, Omar Mukama, Lingwen Zeng, Shaowen Wang
Frontiers in Microbiology.2020;[Epub] 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
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Infection status with zoonotic trematode metacercariae in fish from Lao PDR
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Fishborne zoonotic heterophyid infections: An update
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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
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The importance of wild fish in the epidemiology of Clonorchis sinensis in Vietnam
Thanh Ngoc Bui, Thanh Thi Pham, Nguyen Thi Nguyen, Ha Van Nguyen, Darwin Murrell, Van Thi Phan
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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
The Korean Journal of Parasitology.2016; 54(4): 497. CrossRef
Integrated parasite management: path to sustainable control of fishborne trematodes in aquaculture
Jesper H. Clausen, Henry Madsen, Phan Thi Van, Anders Dalsgaard, K. Darwin Murrell
Trends in Parasitology.2015; 31(1): 8. CrossRef
Infection Status of Zoonotic Trematode Metacercariae in Fishes from Vientiane Municipality and Champasak Province in Lao PDR
Keeseon S. Eom, Han-Sol Park, Dongmin Lee, Woon-Mok Sohn, Tai-Soon Yong, Jong-Yil Chai, Duk-Young Min, Han-Jong Rim, Bounnaloth Insisiengmay, Bounlay Phommasack
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Minami Kawasaki, Jerome Delamare-Deboutteville, Cecile Dang, Andrew C. Barnes
Fish & Shellfish Immunology.2013; 35(6): 1937. CrossRef
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Raúl Míguez-Lozano, Trinidad V. Pardo-Carranza, Isabel Blasco-Costa, Juan Antonio Balbuena
Journal of Parasitology.2012; 98(5): 904. CrossRef
Prevention and Control of Fish-borne Zoonotic Trematodes in Fish Nurseries, Vietnam
Jesper Hedegaard Clausen, Henry Madsen, K. Darwin Murrell, Phan Thi Van, Ha Nguyen Thi Thu, Dung Trung Do, Lan Anh Nguyen Thi, Hung Nguyen Manh, Anders Dalsgaard
Emerging Infectious Diseases.2012; 18(9): 1438. CrossRef
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A survey of Heterophyes nocens and Pygidiopsis summa metacercariae in mullets and gobies along the coastal areas of the Republic of Korea: Sang-Mee Guk, Eun-Hee Shin, Jae-Lip Kim, Woon-Mok Sohn, Kwang-Sun Hong, Cheong-Ha Yoon, Soon-Hyung Lee, Han-Jong Rim, Jong-Yil Chai; Korean J Parasitol 2007;45(3):205-211.
Published online September 20, 2007; DOI: https://doi.org/10.3347/kjp.2007.45.3.205

Abstract
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The infection status of mullets Mugil cephalus (n = 139) and gobies (n = 35) Acanthogobius flavimanus with metacercariae of Heterophyes nocens and Pygidiopsis summa was examined in 11 western, southern, and eastern coastal areas of the Republic of Korea, using a digestion technique. Heterophyid metacercariae were highly prevalent in mullets from western and southern coastal areas; Shinan-gun (100% for H. nocens and 100% for P. summa), Muan-gun (93% and 100%), Buan-gun (42% and 75%), Seocheon-gun (73% and 53%), Ganghwa-gun (47% and 100%), Sacheon-shi (47% and 77%), and Gangjin-gun (50% and 70%, respectively). Only 1 (10%) of 10 mullets from an eastern coastal area, i.e., Donghae-shi, was positive for P. summa metacercariae. Metacercarial densities were the highest in the trunk of mullets for H. nocens and the gill for P. summa. Gobies from Muan-gun were positive for H. nocens (40%) and P. summa metacercariae (40%), and gobies from Seocheon-gun revealed H. nocens metacercariae (20%). The metacercarial density was remarkably higher in mullets than in gobies. The results revealed that H. nocens and P. summa metacercariae are prevalent in mullets and gobies from coastal areas of the Republic of Korea, and the prevalence and intensity of infection vary according to geographical locality.

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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 Zoonotic Trematode Metacercariae in Yellowfin Goby, Acanthogobius flavimanus, from Coastal Areas of Republic of Korea
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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
The Korean Journal of Parasitology.2016; 54(4): 497. CrossRef
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Jong-Yil Chai
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Jong-Yil Chai, Eun-Hee Shin, Soon-Hyung Lee, Han-Jong Rim
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The Korean Journal of Parasitology.2008; 46(2): 77. CrossRef

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A new endemic focus of Gymnophalloides seoi infection on Aphae Island, Shinan-gun, Jeollanam-do: Jae-Hwan Park, Sang-Mee Guk, Eun-Hee Shin, Hyo-Jin Kim, Jae-Lip Kim, Min Seo, Yun-Kyu Park, Jong-Yil Chai; Korean J Parasitol 2007;45(1):39-44.
Published online March 20, 2007; DOI: https://doi.org/10.3347/kjp.2007.45.1.39

Abstract
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A new endemic focus of Gymnophalloides seoi infection has been discovered on Aphae Island (Shinan-gun, Jeollanam-do), Republic of Korea. This area, which is referred to as Bokyong-ri, is a small seashore village located in the northern portion of the island. Fecal samples were collected from a total of 57 residents and examined by the Kato-Katz and formalin-ether sedimentation techniques. Helminth eggs were detected in 37 samples (64.9%); 33 samples were positive for G. seoi eggs (57.9%), 4 for Pygidiopsis summa (7.0%), 13 for other heterophyids (22.8%), 1 for Clonorchis sinensis (1.7%), and 1 for Trichuris trichiura (1.7%). Women (70.4%) revealed higher rates of G. seoi infection than did men (46.7%), and individuals older than 50 years of age also evidenced higher rates of G. seoi infection than in other age groups (P< 0.05). In worm collection from 13 G. seoi egg positive cases, G. seoi (total 86,558 specimens), Heterophyes nocens (278), Stictodora sp. (10), Heterophyopsis continua (3), P. summa (3), and unidentified flukes (42) were collected. Oysters, the source of G. seoi infection, were collected from an area proximal to the village and 50 were examined for metacercariae; 47 (94%) were found infected and the observed metacercarial density was 9.5 ± 8.9 per oyster. The results of this study indicate that Bokyong-ri is a new endemic area of G. seoi infection, with high rates of infection in humans and oysters.

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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
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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
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Heterophyid metacercarial infections in brackish water fishes from Jinju-man (Bay), Kyongsangnam-do, Korea: Do Gyun Kim, Tong-Soo Kim, Shin-Hyeong Cho, Hyeon-Je Song, Woon-Mok Sohn; Korean J Parasitol 2006;44(1):7-13.
Published online March 20, 2006; DOI: https://doi.org/10.3347/kjp.2006.44.1.7

Abstract
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Heterophyid metacercarial infections in brackish water fishes, i.e., perch, shad, mullet, redlip mullet, and goby, of Jinju-man (Bay), Kyongsangnam-do, Korea, were investigated using a digestion technique. Among 45 perch (Lateolabrax japonicus), the metacercariae of Heterophyopsis continua were found in 55.6% (18.5 metacercariae per fish), Stictodora spp. in 28.9% (3.6), and Metagonimus takahashii in 6.7% (17.0). The metacercariae of H. continua were detected in 23 (65.7%) of 35 shad (Konosirus punctatus). Among 15 mullet (Mugil cephalus), the metacercariae of Pygidiopsis summa were found in 100% (105.9 metacercariae per fish), Heterophyes nocens in 40.0% (8.5), H. continua in 13.3%, and Stictodora spp. in 6.7%. Among 12 redlip mullet (Chelon haematocheilus), the metacercariae of P. summa were detected in 91.7% (1,299 metacercariae per fish), H. nocens in 16.7%, and Stictodora spp. in 16.7%. Among 35 gobies (Acanthogobius flavimanus), the metacercariae of Stictodora spp. were found in 82.9% (44.5 metacercariae per fish), and H. continua in 25.7% (2.8). The adult flukes recovered from a cat experimentally infected with metacercariae from perches were compatible with M. takahashii. The results confirm that the estuarine fish in Jinju-man (Bay) are heavily infected with heterophyid metacercariae. Furthermore, it was found for the first time that the perch acts as a second intermediate host for M. takahashii.

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Surface ultrastructure of Pygidiopsis summa (Digenea: Heterophyidae) adult flukes: Jong-Yil Chai, Woon-Mok Sohn, Sung-Yil Choi, Soon-Hyung Lee; Korean J Parasitol 2002;40(3):107-112.
Published online September 30, 2002; DOI: https://doi.org/10.3347/kjp.2002.40.3.107

Abstract
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A scanning electron microscopic study was performed on the surface ultrastructure of Pygidiopsis summa (Digenea: Heterophyidae) adults. Metacercariae were collected from gills and muscles of mullets (Mugil cephalus) caught in a known endemic area, and adult flukes were harvested from dogs after 8 weeks of experimental infection. The worm was calabash form with its posterior part broader than the anterior part. Tegumental spines were densely distributed over the body surface, except on the suckers and genital apparatus, and around the excretory pore. Well differentiated spines were observed on the anterior half of the body, with 14-16 tips ventrally, and 19-20 tips dorsally. On the oral sucker, three pairs of type I sensory papillae (uni-ciliated knob-like swellings) and one pair of type II sensory papillae (aciliated round-swellings) were observed on the anterior and posterior parts of the lip, respectively. On the lip of the ventral sucker, one pair of type II sensory papillae was distributed only on its posterior part. Sperms were seen emerging from or entering into the genital apparatus. The results showed that the surface ultrastructure of P. summa was unique among the heterophyid trematodes, especially in digitation of tegumental spines and in distribution of sensory papillae on oral and ventral suckers.

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Two endemic foci of heterophyids and other intestinal fluke infections in southern and western coastal areas in Korea: Jong-Yil Chai, Tae-Eui Song, Eun-Taek Han, Sang-Mee Guk, Yun-Kyu Park, Min-Ho Choi, Soon-Hyung Lee; Korean J Parasitol 1998;36(3):155-161.
Published online September 30, 1998; DOI: https://doi.org/10.3347/kjp.1998.36.3.155

Abstract
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Two endemic foci of heterophyid infections were discovered in coastal villages of Puan-gun, Chollabuk-do, and Sachon-gun. Kyongsangnam-do, Korea. Fecal examinations were performed on 153 inhabitants of Puan-gun and 138 of Sachon-gun, using cellophane thick smear and formalin-ether sedimentation technique. The helminth egg and/or protozoan cyst positive rate was 21.5% (33/153) in Puan-gun and 39.1% (54/138) in Sachon-gun. In Puan-gun, the egg positive rate of heterophyids was the highest, 17.6%, and that of other parasites was 0.7-2.6% by parasite species. In Sachon-gun, that of heterophyids was 18.8%, followed by Clonorchis sinensis (12.3%), and other parasites (0.7-5.0%). Twenth-two (Puan-gun) and six (Sachon-gun) heterophyid egg positive cases were treated with praziquantel, and adult flukes were collected from their diarrheic stools. A total of 3,284 adult flukes of Heterophyes nocens was collected from all of the 22 patients treated in Puan-gun (3-778 individually), and other trematodes were also collected from 2-15 patients: Pygidiopsis summa, Stellantchasmus falcalus, Metagonimus yokogawai, M. miyatai, Stictodora fuscata, Heterophyopsis continua, Acanthoparyphium kurogamo, and Gymnophalloides seoi. In Sachon-gun, M. yokogawai (3,007 specimens), H. nocens (120), and S. falcatus (46) were collected from 5 of 6 treated patients, and H. continua and S. lari each from one patient. The present study revealed that heterophyid flukes, especially H. nocens and M. yokogawai, are prevalent in the southern and western coastal areas of Korea where fresh and/or brackish water fishes are popularly eaten raw.

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Shin-Hyeong Cho, In-Sang Kim, Eun-Jung Hwang, Tong-Soo Kim, Byoung-Kuk Na, Woon-Mok Sohn
The Korean Journal of Parasitology.2012; 50(3): 215. CrossRef
Fish-borne Parasitic Diseases
Jong-Yil Chai
Hanyang Medical Reviews.2010; 30(3): 223. CrossRef
Epidemiological Survey on the Infection of Intestinal Flukes in Residents of Muan-gun, Jeollanam-do, the Republic of Korea
Shin-Hyeong Cho, Pyo-Yun Cho, Dong-Min Lee, Tong-Soo Kim, In-Sang Kim, Eun-Jung Hwang, Byoung-Kuk Na, Woon-Mok Sohn
The Korean Journal of Parasitology.2010; 48(2): 133. CrossRef
Foodborne Intestinal Flukes in Southeast Asia
Jong-Yil Chai, Eun-Hee Shin, Soon-Hyung Lee, Han-Jong Rim
The Korean Journal of Parasitology.2009; 47(Suppl): S69. CrossRef
A survey of Heterophyes nocens and Pygidiopsis summa metacercariae in mullets and gobies along the coastal areas of the Republic of Korea
Sang-Mee Guk, Eun-Hee Shin, Jae-Lip Kim, Woon-Mok Sohn, Kwang-Sun Hong, Cheong-Ha Yoon, Soon-Hyung Lee, Han-Jong Rim, Jong-Yil Chai
The Korean Journal of Parasitology.2007; 45(3): 205. CrossRef
A new endemic focus of Gymnophalloides seoi infection on Aphae Island, Shinan-gun, Jeollanam-do
Jae-Hwan Park, Sang-Mee Guk, Eun-Hee Shin, Hyo-Jin Kim, Jae-Lip Kim, Min Seo, Yun-Kyu Park, Jong-Yil Chai
The Korean Journal of Parasitology.2007; 45(1): 39. CrossRef
A new endemic focus of Heterophyes nocens and other heterophyid infections in a coastal area of Gangjin-gun, Jeollanam-do
Jae-Hwan Park, Jae-Lip Kim, Eun-Hee Shin, Sang-Mee Guk, Yun-Kyu Park, Jong-Yil Chai
The Korean Journal of Parasitology.2007; 45(1): 33. CrossRef
Prevalence of Gymnophalloides seoi infection in coastal villages of Haenam-gun and Yeongam-gun, Republic of Korea
Sang-Mee Guk, Jae-Hwan Park, Eun-Hee Shin, Jae-Lip Kim, Aifen Lin, Jong-Yil Chai
The Korean Journal of Parasitology.2006; 44(1): 1. CrossRef
Food-borne Parasitic Diseases
Jong-Yil Chai
Journal of the Korean Medical Association.2004; 47(6): 496. CrossRef
Surface ultrastructure of Pygidiopsis summa (Digenea: Heterophyidae) adult flukes
Jong-Yil Chai, Woon-Mok Sohn, Sung-Yil Choi, Soon-Hyung Lee
The Korean Journal of Parasitology.2002; 40(3): 107. CrossRef
Food-borne intestinal trematode infections in the Republic of Korea
Jong-Yil Chai, Soon-Hyung Lee
Parasitology International.2002; 51(2): 129. CrossRef
Stictodora lari (Digenea: Heterophyidae): The Discovery of the First Human Infections
J-Y. Chai, E-T. Han, Y-K. Park, S-M. Guk, J-H. Park, S-H. Lee
Journal of Parasitology.2002; 88(3): 627. CrossRef
Intestinal histopathology and in situ postures of Gymnophalloides seoi in experimentally infected mice
Jong-Yil Chai, Hong-Soon Lee, Sung-Jong Hong, Jae Hyung Yoo, Sang-Mee Guk, Min Seo, Min-Ho Choi, Soon-Hyung Lee
The Korean Journal of Parasitology.2001; 39(1): 31. CrossRef
A nationwide survey of the prevalence of human Gymnophalloides seoi infection on western and southern coastal islands in the Republic of Korea
Jong-Yil Chai, Jae-Hwan Park, Eun-Taek Han, Eun-Hee Shin, Jae-Lip Kim, Kwang-Seon Hong, Han-Jong Rim, Soon-Hyung Lee
The Korean Journal of Parasitology.2001; 39(1): 23. CrossRef
A review of Gymnophalloides seoi (Digenea: Gymnophallidae) and human infections in the Republic of Korea
Soon-Hyung Lee, Jong-Yil Chai
The Korean Journal of Parasitology.2001; 39(2): 85. CrossRef
High endemicity of Metagonimus yokogawai infection among residents of Samchok-shi, Kangwon-do
Jong-Yil Chai, Eun-Taek Han, Yun-Kyu Park, Sang-Mee Guk, Jae-Lip Kim, Soon-Hyung Lee
The Korean Journal of Parasitology.2000; 38(1): 33. CrossRef
Persistent endemicity of Gymnophalloides seoi infection in a southwestern coastal village of Korea with special reference to its egg laying capacity in the human host
Jong-Yil Chai, Geun Chan Lee, Yun-Kyu Park, Eun-Taek Han, Min Seo, Jin Kim, Sang-Mee Guk, Eun-Hee Shin, Min-Ho Choi, Soon-Hyung Lee
The Korean Journal of Parasitology.2000; 38(2): 51. CrossRef
An incidental case of human Heterophyes nocens infection diagnosed by sectional morphology in a biopsy specimen of the small intestine
Yong-Suk Ryang, Chi-Young Lee, Kyu-Jae Lee, Soon-Hyung Lee, Jong-Yil Chai
The Korean Journal of Parasitology.1999; 37(3): 189. CrossRef