Parasites, Hosts and Diseases

"Eui-Hyug Hoang"

Original Article

Echinostoma miyagawai Ishii, 1932 (Echinostomatidae) from Ducks in Aceh Province, Indonesia with Special Reference to Its Synonymy with Echinostoma robustum Yamaguti, 1935: Jong-Yil Chai, Bong-Kwang Jung, Taehee Chang, Hyejoo Shin, Jaeeun Cho, Jin-Youp Ryu, Hyun-Seung Kim, Kwanghoon Park, Mun-Hyoo Jeong, Eui-Hyug Hoang, Marzuki Bin Muhammad Abdullah; Korean J Parasitol 2021;59(1):35-45.
Published online February 19, 2021; DOI: https://doi.org/10.3347/kjp.2021.59.1.35

Abstract
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Adult echinostomes having 37 collar spines collected from the intestine of Pitalah ducks in Aceh Province, Indonesia in 2018 were morphologically and molecularly determined to be Echinostoma miyagawai Ishii, 1932 (Digenea: Echinostomatidae). Among 20 ducks examined, 7 (35.0%) were found to be infected with this echinostome, and the number of flukes collected was 48 in total with average 6.9 (1-17) worms per duck. The adult flukes were 7.2 (6.1-8.5) mm in length and 1.2 (1.0-1.4) mm in width (pre-ovarian or testicular level) and characterized by having a head collar armed with 37 collar spines (dorsal spines arranged in 2 alternating rows), including 5 end group spines, and variable morphology of the testes, irregularly or deeply lobed (3-5 lobes) at times with horizontal extension. The eggs within the worm uterus were 93 (79-105) ?m long and 62 (56-70) ?m wide. These morphological features were consistent with both E. miyagawai and Echinostoma robustum, for which synonymy to each other has been raised. Sequencing of 2 mitochondrial genes, cox1 and nad1, revealed high homology with E. miyagawai (98.6-100% for cox1 and 99.0-99.8% for nad1) and also with E. robustum (99.3-99.8% for nad1) deposited in GenBank. We accepted the synonymy between the 2 species and diagnosed our flukes as E. miyagawai (syn. E. robustum) with redescription of its morphology. Further studies are required to determine the biological characteristics of E. miyagawai in Aceh Province, Indonesia, including the intermediate host and larval stage information.

Citations

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Development of a duplex loop-mediated isothermal amplification together with lateral flow dipstick assay for the detection and discrimination of parasitic infections in chickens between cestodes belonging to genus Raillietina and trematodes in family Echi
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Research in Veterinary Science.2025; 185: 105539. 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
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Phylogeny and morphology of some Palearctic echinostomatid digeneans from rallid bird Fulica atra Linnaeus, 1758
Sergei A. Vlasenkov, Mikhail Yu. Shchelkanov, Sergey G. Sokolov
Biologia.2025; 80(11): 3079. CrossRef
Catatropis indicus (Digenea: Notocotylidae) from ducks in Indonesia with a brief review of the genus Catatropis
Jong-Yil Chai, Bong-Kwang Jung, Taehee Chang, Sooji Hong, Hyejoo Shin, Marzuki Bin Muhammad Abdullah
Parasites, Hosts and Diseases.2025; 63(4): 303. CrossRef
Development and utilization of a visual loop-mediated isothermal amplification coupled with a lateral flow dipstick (LAMP-LFD) assay for rapid detection of Echinostomatidae metacercaria in edible snail samples
Wasin Panich, Phonkawin Jaruboonyakorn, Awika Raksaman, Thanawan Tejangkura, Thapana Chontananarth
International Journal of Food Microbiology.2024; 418: 110732. CrossRef
Molecular epidemiological analyses reveal extensive connectivity between Echinostoma revolutum (sensu stricto) populations across Eurasia and species richness of zoonotic echinostomatids in England
Egie E. Enabulele, Scott P. Lawton, Anthony J. Walker, Ruth S. Kirk, Hudson Alves Pinto
PLOS ONE.2023; 18(2): e0270672. CrossRef
A new cryptic species of Echinostoma (Trematoda: Echinostomatidae) closely related to Echinostoma paraensei found in Brazil
Marisa C. Valadão, Philippe V. Alves, Danimar López-Hernández, Jordana C. A. Assis, Paulo R. S. Coelho, Stefan M. Geiger, Hudson A. Pinto
Parasitology.2023; 150(4): 337. CrossRef
A new species ofEchinostoma(Trematoda: Echinostomatidae) from the ‘revolutum’ group found in Brazil: refuting the occurrence ofEchinostoma miyagawai(=E. robustum) in the Americas
Marisa C. Valadão, Danimar López-Hernández, Philippe V. Alves, Hudson A. Pinto
Parasitology.2022; 149(3): 325. CrossRef
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
The Korean Journal of Parasitology.2021; 59(1): 47. CrossRef

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Brief Communications

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.

Citations

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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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Echinostoma ilocanum Infection in Two Residents of Savannakhet Province, Lao PDR: Jong-Yil Chai, Woon-Mok Sohn, Jaeeun Cho, Keeseon S. Eom, Tai-Soon Yong, Duk-Young Min, Eui-Hyug Hoang, Bounlay Phommasack, Bounnaloth Insisiengmay, Han-Jong Rim; Korean J Parasitol 2018;56(1):75-79.
Published online February 28, 2018; DOI: https://doi.org/10.3347/kjp.2018.56.1.75

Abstract
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Adult specimens of Echinostoma ilocanum (Garrison, 1908) Odhner, 1911 (Trematoda: Echinostomatidae) were recovered from 2 riparian people who resided along the Mekong River in Savannakhet Province, Lao PDR. In fecal examinations done by the Kato-Katz technique, they revealed echinostome eggs together with eggs of Opisthorchis viverrini (and minute intestinal fluke eggs) and hookworms. To recover the adult flukes, they were treated with praziquantel 30-40 mg/kg in a single dose and purged with magnesium salts. A total of 658 adult fluke specimens were recovered from the 2 people; 456 from case 1 and 202 from case 2. Specimens from case 1 consisted of 335 echinostomes (301 E. ilocanum and 34 species undetermined), 120 O. viverrini, and 1 Haplorchis taichui, and those from case 2 consisted of 36 E. ilocanum, 134 O. viverrini, and 32 H. taichui. Thus, the number of E. ilocanum specimens was 337 in total (average per person, 168.5). From this study, it is suggested that foodborne intestinal flukes and liver flukes are highly prevalent along the Mekong River in Savannakhet Province. The present report describes for the first time human infections with E. ilocanum in Lao PDR.

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Neglected food-borne trematodiases: echinostomiasis and gastrodiscoidiasis
Rafael Toledo, María Álvarez-Izquierdo, J. Guillermo Esteban, Carla Muñoz-Antoli
Parasitology.2022; 149(10): 1319. CrossRef
General overview of the current status of human foodborne trematodiasis
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Jong-Yil Chai, Bong-Kwang Jung
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Echinostoma aegyptica (Trematoda: Echinostomatidae) Infection in Five Riparian People in Savannakhet Province, Lao PDR
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The Korean Journal of Parasitology.2020; 58(1): 67. CrossRef
Echinostoma mekongi n. sp. (Digenea: Echinostomatidae) from Riparian People along the Mekong River in Cambodia
Jaeeun Cho, Bong-Kwang Jung, Taehee Chang, Woon-Mok Sohn, Muth Sinuon, Jong-Yil Chai
The Korean Journal of Parasitology.2020; 58(4): 431. CrossRef
Echinochasmus caninus n. comb. (Trematoda: Echinostomatidae) Infection in Eleven Riparian People in Khammouane Province, Lao PDR
Jong-Yil Chai, Taehee Chang, Bong-Kwang Jung, Hyejoo Shin, Woon-Mok Sohn, Keeseon S. Eom, Tai-Soon Yong, Duk-Young Min, Bounlay Phammasack, Bounnaloth Insisiengmay, Han-Jong Rim
The Korean Journal of Parasitology.2019; 57(4): 451. CrossRef

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Original Articles

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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Larval Gnathostoma spinigerum Detected in Asian Swamp Eels, Monopterus albus, Purchased from a Local Market in Yangon, Myanmar: 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 2015;53(5):619-625.
Published online October 29, 2015; DOI: https://doi.org/10.3347/kjp.2015.53.5.619

Abstract
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The present study was performed to determine the infection status of swamp eels with Gnathostoma sp. larvae in Myanmar. We purchased total 37 Asian swamp eels, Monopterus albus, from a local market in Yangon in June and December 2013 and 2014. All collected eels were transferred with ice to our laboratory and each of them was examined by the artificial digestion technique. A total of 401 larval gnathostomes (1-96 larvae/eel) were detected in 33 (89.2%) swamp eels. Most of the larvae (n=383; 95.5%) were found in the muscle. The remaining 18 larvae were detected in the viscera. The advanced third-stage larvae (AdL₃) were 2.3-4.4 mm long and 0.25-0.425 mm wide. The characteristic head bulb (0.093 × 0.221 mm in average size) with 4 rows of hooklets, muscular long esophagus (1.025 mm), and 2 pairs of cervical sacs (0.574 mm) were observed by light microscopy. The average number of hooklets in the 1st, 2nd, 3rd, and 4th rows was 41, 45, 48, and 51, respectively. As scanning electron microscopic findings, the characteristic 4-5 rows of hooklets on the head bulb, a cervical papilla, tegumental spines regularly arranged in the transverse striations, and an anus were well observed. Based on these morphological characters, they were identified as the AdL₃ of Gnathostoma spinigerum. By the present study, it has been confirmed for the first time that Asian swamp eels, M. albus, from Yangon, Myanmar are heavily infected with G. spinigerum larvae.

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Prevalence of Intestinal Helminths among Inhabitants of Cambodia (2006-2011): Tai-Soon Yong, Jong-Yil Chai, Woon-Mok Sohn, Keeseon S. Eom, Hoo-Gn Jeoung, Eui-Hyug Hoang, Cheong-Ha Yoon, Bong-Kwang Jung, Soon-Hyung Lee, Muth Sinuon, Duong Socheat; Korean J Parasitol 2014;52(6):661-666.
Published online December 23, 2014; DOI: https://doi.org/10.3347/kjp.2014.52.6.661

Abstract
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In order to investigate the status of intestinal helminthic infections in Cambodia, epidemiological surveys were carried out on a national scale, including 19 provinces. A total of 32,201 fecal samples were collected from schoolchildren and adults between 2006 and 2011 and examined once by the Kato-Katz thick smear technique. The overall egg positive rate of intestinal helminths was 26.2%. The prevalence of hookworms was the highest (9.6%), followed by that of Opisthorchis viverrini/minute intestinal flukes (Ov/MIF) (5.7%), Ascaris lumbricoides (4.6%), and Trichuris trichiura (4.1%). Other types of parasites detected were Enterobius vermicularis (1.1%), Taenia spp. (0.4%), and Hymenolepis spp. (0.2%). The northwestern regions such as the Siem Reap, Oddar Meanchey, and Banteay Meanchey Provinces showed higher prevalences (17.4-22.3%) of hookworms than the other localities. The southwestern areas, including Koh Kong and Preah Sihanouk Provinces showed higher prevalences of A. lumbricoides (17.5-19.2%) and T. trichiura (6.1-21.0%). Meanwhile, the central and southern areas, in particular, Takeo and Kampong Cham Provinces, showed high prevalences of Ov/MIF (23.8-24.0%). The results indicate that a considerably high prevalence of intestinal helminths has been revealed in Cambodia, and thus sustained national parasite control projects are necessary to reduce morbidity due to parasitic infections in Cambodia.

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Zoonotic Trematode Metacercariae in Fish from Phnom Penh and Pursat, Cambodia: Jong-Yil Chai, Woon-Mok Sohn, Byoung-Kuk Na, Tai-Soon Yong, Keeseon S. Eom, Cheong-Ha Yoon, Eui-Hyug Hoang, Hoo-Gn Jeoung, Duong Socheat; Korean J Parasitol 2014;52(1):35-40.
Published online February 19, 2014; DOI: https://doi.org/10.3347/kjp.2014.52.1.35

Abstract
PDF

A survey was performed to investigate the infection status of freshwater fish with zoonotic trematode metacercariae in Phnom Penh and Pursat Province, Cambodia. All collected fish with ice were transferred to our laboratory and examined using the artificial digestion method. In fish from Phnom Penh, 2 kinds of metacercariae (Opisthorchis viverrini and Haplorchis yokogawai) were detected. O. viverrini metacercariae were positive in 37 (50.0%) of 74 fish in 11 species (average no. metacercariae/fish, 18.6). H. yokogawai metacercariae were detected in 23 (57.5%) of 40 fish in 5 species (average no. metacercariae/fish, 21.0). In fish from Pursat Province, 5 kinds of metacercariae (O. viverrini, H. yokogawai, Haplorchis pumilio, Centrocestus formosanus, and Procerovum sp.) were detected; O. viverrini metacercariae (n=3) in 2 fish species (Henicorhynchus lineatus and Puntioplites falcifer), H. yokogawai metacercariae (n=51) in 1 species (P. falcifer), H. pumilio metacercariae (n=476) in 2 species (H. lineatus and Pristolepis fasciata), C. formosanus metacercariae (n=1) in 1 species (H. lineatus), and Procerovum sp. metacercariae (n=63) in 1 species (Anabas testudineus). From the above results, it has been confirmed that various freshwater fish play the role of a second intermediate host for zoonotic trematodes (O. viverrini, H. yokogawai, H. pumilio, C. formosanus, and Procerovum sp.) in Cambodia.

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Fishborne Trematode Metacercariae in Luang Prabang, Khammouane, and Saravane Province, Lao PDR: Han-Jong Rim, Woon-Mok Sohn, Tai-Soon Yong, Keeseon S. Eom, Jong-Yil Chai, Duk-Young Min, Soon-Hyung Lee, Eui-Hyug Hoang, Bounlay Phommasack, Sithat Insisiengmay; Korean J Parasitol 2013;51(1):107-114.
Published online February 18, 2013; DOI: https://doi.org/10.3347/kjp.2013.51.1.107

Abstract
PDF

Fishborne trematode (FBT) metacercariae were investigated in fish from 3 Provinces of Lao PDR. Total 242 freshwater fish of 40 species were collected in local markets of Luang Prabang (59 fish of 16 species), Khammouane (81 fish of 19 species), and Saravane (97 fish of 14 species), and each of them was examined by artificial digestion method. Four species of metacercariae (Opisthorchis viverrini, Haplorchis taichui, Haplorchis yokogawai, and Centrocestus formosanus) were detected. O. viverrini was detected in 35 fish (14.5%), and their density was 252 per infected fish (Luang Prabang, 88 metacercariae in 5 fish; Khammouane, 187 in 6 fish; Saravane, 303 in 24 fish). H. taichui was found in 102 fish (42.1%), and their density was 485 per infected fish (Luang Prabang, 260 metacercariae in 38 fish; Khammouane, 1,084 in 23 fish; Saravane, 359 in 41 fish). H. yokogawai was detected in 92 fish (38.0%), and their density was 222 per infected fish (Luang Prabang, 362 metacercariae in 17 fish; Khammouane, 126 in 20 fish; Saravane, 214 in 55 fish). Metacercariae of C. formosanus were found in 8 fish (3.3%), and their density was 3 per infected fish. In the present study, it has been confirmed that FBT metacercariae, in particular, H. taichui, H. yokogawai, and O. viverrini, are highly prevalent in fish from Luang Prabang, Khammouane, and Saravane Province, Lao PDR.

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Brief Communications

Echinostome Flukes Receovered from Humans in Khammouane Province, Lao PDR: Jong-Yil Chai, Woon-Mok Sohn, Tai-Soon Yong, Keeseon S. Eom, Duk-Young Min, Eui-Hyug Hoang, Bounlay Phammasack, Bounnaloth Insisiengmay, Han-Jong Rim; Korean J Parasitol 2012;50(3):269-272.
Published online August 13, 2012; DOI: https://doi.org/10.3347/kjp.2012.50.3.269

Abstract
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Echinostome eggs were detected in 22 (1.1%) of 2,074 people residing in riparian villages along the Mekong River in Khammouane Province, Lao PDR. In order to recover the adult flukes, 9 persons were treated with praziquantel and purged with magnesium salts. A total of 55 echinostome specimens (4 species) were recovered from the 9 persons. Echinostoma revolutum (8 specimens) was recovered from 3 persons, Artyfechinostomum malayanum (8 specimens) was from 2 persons, Echinochasmus japonicus (33 specimens) was from 7 persons, and Euparyphium sp. (6 specimens) was from 1 person. In Lao PDR, only human infections with E. japonicus were previously known. Therefore, the present study describes human infections with E. revolutum, A. malayanum, and Euparyphium sp. for the first time in Lao PDR. These results indicate that the surveyed villages of Khammouane Province, Lao PDR are low-grade endemic foci of echinostomiasis.

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High Prevalence of Opisthorchis viverrini Infection in a Riparian Population in Takeo Province, Cambodia: Tai-Soon Yong, Eun-Hee Shin, Jong-Yil Chai, Woon-Mok Sohn, Keeseon S. Eom, Dong-Min Lee, Keunhee Park, Hoo-Gn Jeoung, Eui-Hyug Hoang, Yoon-Hee Lee, Hyun-Ju Woo, Ji-Hwa Lee, Sin-Il Kang, Jae-Ku Cha, Keon-Hoon Lee, Cheong-Ha Yoon, Muth Sinuon, Duong Socheat; Korean J Parasitol 2012;50(2):173-176.
Published online May 24, 2012; DOI: https://doi.org/10.3347/kjp.2012.50.2.173

Abstract
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Opisthorchis viverrini infection was found to be highly prevalent in 3 riverside villages (Ang Svay Chek A, B, and C) of the Prey Kabas District, Takeo Province. This area is located in the southern part of Cambodia, where the recovery of adult O. viverrini worms was recently reported. From May 2006 until May 2010, fecal examinations were performed on a total of 1,799 villagers using the Kato-Katz thick smear technique. In the 3 villages, the overall positive rate for helminth eggs ranged from 51.7 to 59.0% (av. 57.4%), and the percentage positive for O. viverrini was 46.4-50.6% (47.5%). Other helminths detected included hookworms (13.2%), echinostomes (2.9%), Trichuris trichiura (1.3%), Ascaris lumbricoides (0.6%), and Taenia spp. (0.06%). The prevalence of O. viverrini eggs appeared to reflect a lower infection in younger individuals (<20 years) than in the adult population (>20 years). Men (50.4%) revealed a significantly higher (P=0.02) prevalence than women (44.3%). The Ang Svay Chek villages of the Prey Kabas District, Takeo Province, Cambodia have been confirmed to be a highly endemic area for human O. viverrini infection.

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Original Articles

Fishborne Trematode Metacercariae in Freshwater Fish from Guangxi Zhuang Autonomous Region, China: Woon-Mok Sohn, Keeseon S. Eom, Duk-Young Min, Han-Jong Rim, Eui-Hyug Hoang, Yichao Yang, Xueming Li; Korean J Parasitol 2009;47(3):249-257.
Published online August 28, 2009; DOI: https://doi.org/10.3347/kjp.2009.47.3.249

Abstract
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A survey was performed to investigate the infection status of fishborne trematode (FBT) metacercariae in freshwater fish from Guangxi Zhuang Autonomous Region, China. A total of 307 freshwater fish of 31 species were collected from 5 administrative regions of Guangxi Zhuang Autonomous Region. They were examined by artificial digestion method from July 2003 to August 2004. No metacercariae were detected in fish from Fusui-xian. In fish from Mashan-xian and a market in Nanning, 3 species of metacercariae, Haplorchis taichui, Haplorchis pumilio, and Centrocestus formosanus, were mainly detected. Metacercariae (8 in number) of Clonorchis sinensis were found in 1 Chanodichthys dabryi purchased from a market in Nanning. In fish from Yangshuo, Metagonimus yokogawai metacercariae were detected from all 18 fish species examined. Total 13 C. sinensis metacercariae were found in 3 out of 10 Hemibarbus maculatus from Yangshuo. All 7 Zacco platypus from Yangshuo were infected with 8-112 Echinochasmus perfoliatus metacercariae. In fish from Binyang-xian, H. pumilo metacercariae were mainly detected in all 5 fish species examined, and only 1 metacercaria of C. sinensis was found in a Hemiculter leucisculus. From the above results, it was confirmed that some species of freshwater fish play a role of second intermediate hosts for FBT in Guangxi Zhuang Autonomous Region, China. In particular, 4 species of intestinal flukes, M. yokogawai, H. taichui, H. pumilio, and C. formosanus, were prevalent in fish hosts, whereas C. sinensis metacercariae were detected only in 3 fish species.

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High Prevalence of Haplorchis taichui, Phaneropsolus molenkampi, and Other Helminth Infections among People in Khammouane Province, Lao PDR: Jong-Yil Chai, Eun-Taek Han, Eun-Hee Shin, Woon-Mok Sohn, Tai-Soon Yong, Keeseon S. Eom, Duk-Young Min, Jin-Young Um, Min-Sung Park, Eui-Hyug Hoang, Bounlay Phommasack, Bounnaloth Insisiengmay, Soon-Hyung Lee, Han-Jong Rim; Korean J Parasitol 2009;47(3):243-247.
Published online August 28, 2009; DOI: https://doi.org/10.3347/kjp.2009.47.3.243

Abstract
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The prevalence of liver and intestinal helminth infections, including Opisthorchis, Haplorchis, Phaneropsolus, hookworms, Enterobius, and Taenia, was surveyed in Khammouane province, Lao PDR. Fecal specimens were collected from 1,242 people (590 men and 652 women) in 3 Mekong riverside villages and were examined by the Kato-Katz thick smear technique. The overall helminth egg positive rate was 81.1%. The positive rate for small trematode eggs, including Opisthorchis viverrini, heterophyids, and lecithodendriids, was 81.1% and the positive rate for hookworms was 6.7%. To obtain adult worms, 35 people who were positive for small trematode eggs were treated with 20-30 mg/kg praziquantel and 10-15 mg/kg pyrantel pamoate, and then purged. Diarrheic stools were collected from 33 of these people and searched for helminth parasites using a stereomicroscope. Mixed infections with various helminths (Haplorchis taichui, Haplorchis yokogawai, Prosthodendrium molenkampi, Phaneropsolus bonnei, echinostomes, hookworms, Trichostrongylus spp., Trichuris trichiura, Enterobius vermicularis, and/or Taenia saginata) were found. The total number of helminth specimens collected was 20,907 (approximately 634 per person). The most common species was H. taichui, followed by P. molenkampi, O. viverrini, P. bonnei, E. vermicularis, hookworms, and Trichostrongylus spp. These results show that diverse species of intestinal nematodes, trematodes, and cestodes are infecting humans in Khammouane province, Lao PDR.

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Fishborne Trematode Metacercariae Detected in Freshwater Fish from Vientiane Municipality and Savannakhet Province, Lao PDR: Han-Jong Rim, Woon-Mok Sohn, Tai-Soon Yong, Keeseon S. Eom, Jong-Yil Chai, Duk-Young Min, Soon-Hyung Lee, Eui-Hyug Hoang, Bounlay Phommasack, Sithat Insisengmay; Korean J Parasitol 2008;46(4):253-260.
Published online December 20, 2008; DOI: https://doi.org/10.3347/kjp.2008.46.4.253

Abstract
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Freshwater fish from Vientiane Municipality and Savannakhet Province, Lao PDR were examined by the muscle compression and artificial digestion methods to know the infection status with trematode metacercariae. In the fish from Savannakhet, 2 species of metacercariae, Opisthorchis viverrini and Haplorchis taichui, were detected. O. viverrini metacercariae were found in 6 species of fish, Puntius brevis, Hampala dispar, Esomus metallicus, Mystacoleucus marginatus, Puntioplites falcifer, and Cyclocheilichthys armatus. H. taichui metacercariae were detected in 3 species of fish, P. brevis, P. falcifer, and M. marginatus. In the fish from Vientiane, 4 species of metacercariae, O. viverrini, H. taichui, Haplorchis yokogawai, and Centrocestus formosanus, were detected. Among them, O. viverrini metacercariae were found in 7 species of fish, Onychostoma elongatum, C. armatus, H. dispar, P. brevis, Cyclocheilichthys repasson, Osteochilus hasseltii, and Hypsibarbus lagleri. The metacercariae of H. taichui were detected in 6 species of fish, C. repasson, O. elongatum, C. armatus, H. dispar, Labiobarbus leptocheila, and Cirrhinus molitorella. The metacercariae of H. yokogawai were found in 9 species of fish, C. repasson, O. elongatum, C. armatus, H. dispar, Labiobarbus leptocheila, O. hasseltii. C. molitorella, Hypsibarbus wetmorei, and H. lagleri. The metacercariae of C. formosanus were detected in 4 species of fish, C. repasson, P. brevis, O. hasseltii, and C. molitorella. From these results, it is confirmed that fishborne trematode metacercariae, i.e. O. viverrini, H. taichui, H. yokogawai and C. formosanus, are prevalent in various species of freshwater fish from Savannakhet Province and Vientiane Municipality, Lao PDR.

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High prevalence of liver and intestinal fluke infections among residents of Savannakhet Province in Laos: Jong-Yil Chai, Eun-Taek Han, Sang-Mee Guk, Eun-Hee Shin, Woon-Mok Sohn, Tai-Soon Yong, Keeseon S. Eom, Keon-Hoon Lee, Hoo-Gn Jeong, Yong-Sang Ryang, Eui-Hyug Hoang, Bounlay Phommasack, Bounnaloth Insisiengmay, Soon-Hyung Lee, Han-Jong Rim; Korean J Parasitol 2007;45(3):213-218.
Published online September 20, 2007; DOI: https://doi.org/10.3347/kjp.2007.45.3.213

Abstract
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The prevalence of liver and intestinal fluke infections was surveyed on residents of Savannakhet Province, Laos. Fecal specimens were collected from a total of 981 residents in 4 Mekong riverside villages and examined by the Kato-Katz thick smear technique. The results revealed that the overall helminth egg positive rate was 84.2%, and the positive rate for small trematode eggs, including Opisthorchis viverrini, heterophyids, or lecithodendriids, was 67.1%. To obtain adult flukes, 38 small trematode egg positive cases were treated with a 20-30 mg/kg single dose of praziquantel and purged. Diarrheic stools were then collected from 29 people and searched for helminth parasites using stereomicroscopes. Mixed infections with O. viverrini and 6 kinds of intestinal flukes were found, namely, Haplorchis taichui, Haplorchis pumilio, Haplorchis yokogawai, Prosthodendrium molenkampi, Phaneropsolus bonnei, and echinostomes. The total number of flukes collected was 7,693 specimens (av. no. per treated person; 265.3). The most common species was O. viverrini, followed by H. taichui, P. molenkampi, echinostomes, H. pumilio, P. bonnei, and H. yokogawai. The results indicate that foodborne liver and intestinal fluke infections are prevalent among residents of Savannakhet Province, Laos.

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Acta Tropica.2015; 141: 281. CrossRef
Subtle to severe hepatobiliary morbidity in Opisthorchis viverrini endemic settings in southern Laos
Phonepasong Ayé Soukhathammavong, Virasack Rajpho, Khampheng Phongluxa, Youthanavanh Vonghachack, Jan Hattendorf, Bouasy Hongvanthong, Oroth Rasaphon, Banchob Sripa, Kongsap Akkhavong, Christoph Hatz, Peter Odermatt
Acta Tropica.2015; 141: 303. CrossRef
Patterns of trematode infections of Opisthorchis viverrini (Opisthorchiidae) and Haplorchis taichui (Heterophyidae) in human populations from two villages in Savannakhet Province, Lao PDR
M. Sato, T. Pongvongsa, S. Sanguankiat, T. Yoonuan, J. Kobayashi, B. Boupha, F. Nishimoto, K. Moji, M.O. Sato, J. Waikagul
Journal of Helminthology.2015; 89(4): 439. CrossRef
Repeated stool sampling and use of multiple techniques enhance the sensitivity of helminth diagnosis: A cross-sectional survey in southern Lao People's Democratic Republic
Somphou Sayasone, Jürg Utzinger, Kongsap Akkhavong, Peter Odermatt
Acta Tropica.2015; 141: 315. CrossRef
Effect of pond water depth on snail populations and fish-borne zoonotic trematode transmission in juvenile giant gourami ( Osphronemus goramy ) aquaculture nurseries
P.C. Thien, H. Madsen, H.T.N. Nga, A. Dalsgaard, K.D. Murrell
Parasitology International.2015; 64(6): 522. CrossRef
Intestinal Helminths Recovered from Humans in Xieng Khouang Province, Lao PDR with a Particular Note on Haplorchis pumilio Infection
Jong-Yil Chai, Woon-Mok Sohn, Bong-Kwang Jung, Tai-Soon Yong, Keeseon S. Eom, Duk-Young Min, Bounnaloth Insisiengmay, Sithat Insisiengmay, Bounlay Phommasack, Han-Jong Rim
The Korean Journal of Parasitology.2015; 53(4): 439. 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
The Korean Journal of Parasitology.2015; 53(4): 447. CrossRef
Risk Profiling of Hookworm Infection and Intensity in Southern Lao People’s Democratic Republic Using Bayesian Models
Armelle Forrer, Penelope Vounatsou, Somphou Sayasone, Youthanavanh Vonghachack, Dalouny Bouakhasith, Jürg Utzinger, Kongsap Akkhavong, Peter Odermatt, Guo-Jing Yang
PLOS Neglected Tropical Diseases.2015; 9(3): e0003486. CrossRef
Prevalence of Endemic Pig-Associated Zoonoses in Southeast Asia: A Review of Findings from the Lao People's Democratic Republic
Anna L. Okello, Stephanie Burniston, James V. Conlan, Phouth Inthavong, Boualam Khamlome, Susan C. Welburn, Jeffrey Gilbert, John Allen, Stuart D. Blacksell
The American Journal of Tropical Medicine and Hygiene.2015; 92(5): 1059. CrossRef
Prevalence of Haplorchis taichui among humans and fish in Luang Prabang Province, Lao PDR
Woon-Mok Sohn, Tai-Soon Yong, Keeseon S. Eom, Duk-Young Min, Dongmin Lee, Bong-Kwang Jung, Virasack Banouvong, Bounnaloth Insisiengmay, Bounlay Phommasack, Han-Jong Rim, Jong-Yil Chai
Acta Tropica.2014; 136: 74. CrossRef
Prevalence of Helminthic Infections among Inhabitants of Lao PDR
Keeseon S. Eom, Tai-Soon Yong, Woon-Mok Sohn, Jong-Yil Chai, Duk-Young Min, Han-Jong Rim, Hyeong-Kyu Jeon, Virasack Banouvong, Bounnaloth Insisiengmay, Bounlay Phommasack
The Korean Journal of Parasitology.2014; 52(1): 51. CrossRef
Intestinal Parasitic Infections in HIV-Infected Patients, Lao People’s Democratic Republic
Phimpha Paboriboune, Niranh Phoumindr, Elisabeth Borel, Khamphang Sourinphoumy, Saykham Phaxayaseng, Elodie Luangkhot, Bouachanh Sengphilom, Yathmany Vansilalom, Peter Odermatt, Eric Delaporte, Jean- François Etard, Meja Rabodonirina, William A. Paxton
PLoS ONE.2014; 9(3): e91452. CrossRef
Current Status of Human Hookworm Infections, Ascariasis, Trichuriasis, Schistosomiasis Mekongi and Other Trematodiases in Lao People's Democratic Republic
Boualy Keokhamphavanh, Manisak Phommasansak, Oranuch Sanpool, Baunphone Phinmaland, Wanchai Maleewong, Pewpan M. Intapan, Sakhone Laymanivong, Bouasy Hangvanthong
The American Journal of Tropical Medicine and Hygiene.2014; 90(4): 667. CrossRef
Fishborne Trematode Metacercariae in Luang Prabang, Khammouane, and Saravane Province, Lao PDR
Han-Jong Rim, Woon-Mok Sohn, Tai-Soon Yong, Keeseon S. Eom, Jong-Yil Chai, Duk-Young Min, Soon-Hyung Lee, Eui-Hyug Hoang, Bounlay Phommasack, Sithat Insisiengmay
The Korean Journal of Parasitology.2013; 51(1): 107. CrossRef
Global status of fish-borne zoonotic trematodiasis in humans
Nguyen Hung, Henry Madsen, Bernard Fried
Acta Parasitologica.2013;[Epub] CrossRef
Species Identification of Medically Important Trematodes in Aquatic Food Samples Using PCR-RFLP Targeting 18S rRNA
Kyoung-Ho Pyo, Eun-Young Kang, Young-Sang Hwang, Ho-Chong Jun, Woon-Mok Sohn, Shin-Hyeong Cho, Won-Ja Lee, Jong-Yil Chai, Eun-Hee Shin
Foodborne Pathogens and Disease.2013; 10(3): 290. CrossRef
Hyperendemicity of Haplorchis taichui Infection among Riparian People in Saravane and Champasak Province, Lao PDR
Jong-Yil Chai, Tai-Soon Yong, Keeseon S. Eom, Duk-Young Min, Hyeong-Kyu Jeon, Tae-Yun Kim, Bong-Kwang Jung, Lay Sisabath, Bounnaloth Insisiengmay, Bounlay Phommasack, Han-Jong Rim
The Korean Journal of Parasitology.2013; 51(3): 305. CrossRef
Echinostoma macrorchis in Lao PDR: Metacercariae in Cipangopaludina Snails and Adults from Experimentally Infected Animals
Woon-Mok Sohn, Jong-Yil Chai, Byoung-Kuk Na, Tai-Soon Yong, Keeseon S. Eom, Hansol Park, Duk-Young Min, Han-Jong Rim
The Korean Journal of Parasitology.2013; 51(2): 191. CrossRef
Foodborne Trematode Metacercariae in Fish from Northern Vietnam and Their Adults Recovered from Experimental Hamsters
Jong-Yil Chai, Nguyen Van De, Woon-Mok Sohn
The Korean Journal of Parasitology.2012; 50(4): 317. CrossRef
Prevalence of Opisthorchis viverrini infection in humans and fish in Kratie Province, Cambodia
Woon-Mok Sohn, Tai-Soon Yong, Keeseon S. Eom, Kyoung-Ho Pyo, Mi Youn Lee, Hyemi Lim, Seongjun Choe, Hoo-Gn Jeong, Muth Sinuon, Duong Socheat, Jong-Yil Chai
Acta Tropica.2012; 124(3): 215. CrossRef
Spatial Distribution of, and Risk Factors for, Opisthorchis viverrini Infection in Southern Lao PDR
Armelle Forrer, Somphou Sayasone, Penelope Vounatsou, Youthanavanh Vonghachack, Dalouny Bouakhasith, Steffen Vogt, Rüdiger Glaser, Jürg Utzinger, Kongsap Akkhavong, Peter Odermatt, Simon Brooker
PLoS Neglected Tropical Diseases.2012; 6(2): e1481. CrossRef
Human infections of fish-borne trematodes in Vietnam: Prevalence and molecular specific identification at an endemic commune in Nam Dinh province
Nguyen Van De, Thanh Hoa Le
Experimental Parasitology.2011; 129(4): 355. CrossRef
Opisthorchiasis and Opisthorchis-associated cholangiocarcinoma in Thailand and Laos
Banchob Sripa, Jeffrey M. Bethony, Paiboon Sithithaworn, Sasithorn Kaewkes, Eimorn Mairiang, Alex Loukas, Jason Mulvenna, Thewarach Laha, Peter J. Hotez, Paul J. Brindley
Acta Tropica.2011; 120: S158. CrossRef
Helminth and Intestinal Protozoa Infections, Multiparasitism and Risk Factors in Champasack Province, Lao People's Democratic Republic
Somphou Sayasone, Tippi K. Mak, Monely Vanmany, Oroth Rasphone, Penelope Vounatsou, Jürg Utzinger, Kongsap Akkhavong, Peter Odermatt, Jeffrey Michael Bethony
PLoS Neglected Tropical Diseases.2011; 5(4): e1037. CrossRef
Prevalence of the Intestinal FlukesHaplorchis taichuiandH. yokogawaiin a Mountainous Area of Phongsaly Province, Lao PDR
Jong-Yil Chai, Tai-Soon Yong, Keeseon S. Eom, Duk-Young Min, Eun-Hee Shin, Virasack Banouvong, Bounnaloth Insisiengmay, Sithat Insisiengmay, Bounlay Phommasack, Han-Jong Rim
The Korean Journal of Parasitology.2010; 48(4): 339. CrossRef
Animal Reservoir Hosts and Fish-borne Zoonotic Trematode Infections on Fish Farms, Vietnam
Nguyen Thi Lan Anh, Nguyen Thi Phuong, K. Darwin Murrell, Maria Vang Johansen, Anders Dalsgaard, Luong To Thu, Tran Thi Kim Chi, Stig Milan Thamsborg
Emerging Infectious Diseases.2009; 15(4): 540. CrossRef
Diversity of human intestinal helminthiasis in Lao PDR
Somphou Sayasone, Youthanavane Vonghajack, Monely Vanmany, Oroth Rasphone, Smarn Tesana, Jürg Utzinger, Kongsap Akkhavong, Peter Odermatt
Transactions of the Royal Society of Tropical Medicine and Hygiene.2009; 103(3): 247. CrossRef
Prevalence and risks for fishborne zoonotic trematode infections in domestic animals in a highly endemic area of North Vietnam
Nguyen Thi Lan Anh, Nguyen Thi Phuong, Maria Vang Johansen, K. Darwin Murrell, Phan Thi Van, Anders Dalsgaard, Luong To Thu, Stig Milan Thamsborg
Acta Tropica.2009; 112(2): 198. CrossRef
Rare human infection with the trematode Echinochasmus japonicus in Lao PDR
Somphou Sayasone, Smarn Tesana, Jürg Utzinger, Christoph Hatz, Kongsap Akkhavong, Peter Odermatt
Parasitology International.2009; 58(1): 106. CrossRef
High Prevalence of Haplorchis taichui, Phaneropsolus molenkampi, and Other Helminth Infections among People in Khammouane Province, Lao PDR
Jong-Yil Chai, Eun-Taek Han, Eun-Hee Shin, Woon-Mok Sohn, Tai-Soon Yong, Keeseon S. Eom, Duk-Young Min, Jin-Young Um, Min-Sung Park, Eui-Hyug Hoang, Bounlay Phommasack, Bounnaloth Insisiengmay, Soon-Hyung Lee, Han-Jong Rim
The Korean Journal of Parasitology.2009; 47(3): 243. CrossRef
PCR Diagnosis of Opisthorchis viverrini and Haplorchis taichui Infections in a Lao Community in an Area of Endemicity and Comparison of Diagnostic Methods for Parasitological Field Surveys
Leonore Lovis, Tippi K. Mak, Khampheng Phongluxa, Phonepasong Soukhathammavong, Somphou Sayasone, Kongsap Akkhavong, Peter Odermatt, Jennifer Keiser, Ingrid Felger
Journal of Clinical Microbiology.2009; 47(5): 1517. CrossRef
A review of taeniasis and cysticercosis in the Lao People's Democratic Republic
James Conlan, Syseng Khounsy, Phouth Inthavong, Stanley Fenwick, Stuart Blacksell, R.C. Andrew Thompson
Parasitology International.2008; 57(3): 252. CrossRef
Fishborne Trematode Metacercariae Detected in Freshwater Fish from Vientiane Municipality and Savannakhet Province, Lao PDR
Han-Jong Rim, Woon-Mok Sohn, Tai-Soon Yong, Keeseon S. Eom, Jong-Yil Chai, Duk-Young Min, Soon-Hyung Lee, Eui-Hyug Hoang, Bounlay Phommasack, Sithat Insisengmay
The Korean Journal of Parasitology.2008; 46(4): 253. CrossRef