Parasites, Hosts and Diseases

"liver fluke"

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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Differential Change in the Prevalence of the Ascaris, Trichuris and Clonorchis infection Among Past East Asian Populations: Xiaoya Zhan, Hui-Yuan Yeh, Dong Hoon Shin, Jong-Yil Chai, Min Seo, Piers D. Mitchell; Korean J Parasitol 2019;57(6):601-605.
Published online December 31, 2019; DOI: https://doi.org/10.3347/kjp.2019.57.6.601

Abstract
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As we learn more about parasites in ancient civilizations, data becomes available that can be used to see how infection may change over time. The aim of this study is to assess how common certain intestinal parasites were in China and Korea in the past 2000 years, and make comparisons with prevalence data from the 20th century. This allows us to go on to investigate how and why changes in parasite prevalence may have occurred at different times. Here we show that Chinese liver fluke (Clonorchis sinensis) dropped markedly in prevalence in both Korea and China earlier than did roundworm (Ascaris lumbricoides) and whipworm (Trichuris trichiura). We use historical evidence to determine why this was the case, exploring the role of developing sanitation infrastructure, changing use of human feces as crop fertilizer, development of chemical fertilizers, snail control programs, changing dietary preferences, and governmental public health campaigns during the 20th century.

Citations

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Ancient parasite analysis: Exploring infectious diseases in past societies
Piers D. Mitchell
Journal of Archaeological Science.2024; 170: 106067. CrossRef
Updates on parasite infection prevalence in the Joseon period based on parasitological studies of human coprolites isolated from archaeological sites in the cities of Euijeongbu, Gumi, and Wonju
Chang Seok Oh, Jong-Yil Chai, Sori Min, Kyong Taek Oh, Jeonghwan Seol, Mi Kyung Song, Dong Hoon Shin, Min Seo
Parasites, Hosts and Diseases.2023; 61(1): 89. CrossRef
Liver Fluke Infection Throughout Human Evolution
Tianyi Wang, Piers D. Mitchell
Gastro Hep Advances.2022; 1(4): 500. 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
The what, how and why of archaeological coprolite analysis
Lisa-Marie Shillito, John C. Blong, Eleanor J. Green, Eline N. van Asperen
Earth-Science Reviews.2020; 207: 103196. CrossRef

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Case Reports

A Case of Fascioliasis in A Wild Nutria, Myocastor coypus, in Republic of Korea: Hyo-Seok Kim, Joo-Yeon Kong, Jong-Hyun Kim, Seong-Chan Yeon, Il-Hwa Hong; Korean J Parasitol 2018;56(4):375-378.
Published online August 31, 2018; DOI: https://doi.org/10.3347/kjp.2018.56.4.375

Abstract
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A total of 44 adult or juvenile nutrias were necropsied for disease survey. A large nodule was found in the liver of a nutria. The histopathological specimen of the hepatic nodule was microscopically examined, and sectional worms were found in the bile duct. The worms showed a tegument with spines, highly branches of vitelline glands and intestine. Finally, we histopathologically confirmed fascioliasis in a wild nutria. In the present study, a case of fascioliasis in a wild nutria is first confirmed in Korea.

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The use of Glutathione-S-transferase levels as marker of hepatic damage in chronic fasciolosis in cattle
Al-Hassan Mohammed Mostafa, Gehan Mohammed Sayed, Ali Ali Hassan Al-Ezzi, Alaa Eldin Kamal
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Na-Hyeon Kim, Min-Gyeong Seo, Bumseok Kim, Yu Jeong Jeon, In Jung Jung, Il-Hwa Hong
Parasites, Hosts and Diseases.2025; 63(3): 243. CrossRef
Intestinal parasites of Myocastor coypus (Rodentia, Myocastoridae) on animal farms in Eastern Ukraine
N. V. Sumakova, A. P. Paliy, O. V. Pavlichenko, R. V. Petrov, B. S. Morozov, V. M. Plys, A. B. Mushynskyi
Regulatory Mechanisms in Biosystems.2025; 16(3): e25117. CrossRef
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Safinaz J. Ashoor, Majed H. Wakid
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Pradeep Adhikari, Baek-Jun Kim, Sun-Hee Hong, Do-Hun Lee
Scientific Reports.2022;[Epub] CrossRef
Genetic diversity and relationships of the liver fluke Fasciola hepatica (Trematoda) with native and introduced definitive and intermediate hosts
Antonio A. Vázquez, Emeline Sabourin, Pilar Alda, Clémentine Leroy, Carole Leray, Eric Carron, Stephen Mulero, Céline Caty, Sarah Hasfia, Michel Boisseau, Lucas Saugné, Olivier Pineau, Thomas Blanchon, Annia Alba, Dominique Faugère, Marion Vittecoq, Sylvi
Transboundary and Emerging Diseases.2021; 68(4): 2274. CrossRef
Preputial gland adenoma in a wild nutria (Myocastor coypus): a case report
Joo-Yeon Kong, Hyo-Seok Kim, Seong-Chan Yeon, Jin-Kyu Park, Kyu-Shik Jeong, Il-Hwa Hong
Journal of Veterinary Science.2020;[Epub] CrossRef
Preputial gland adenoma in a wild nutria (Myocastor coypus): a case report
Joo-Yeon Kong, Hyo-Seok Kim, Seong-Chan Yeon, Jin-Kyu Park, Kyu-Shik Jeong, Il-Hwa Hong
Journal of Veterinary Science.2019;[Epub] CrossRef

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A Case of Fasciola hepatica Infection Mimicking Cholangiocarcinoma and ITS-1 Sequencing of the Worm: Bong Kyun Kang, Bong-Kwang Jung, Yoon Suk Lee, In Kyeom Hwang, Hyemi Lim, Jaeeun Cho, Jin-Hyeok Hwang, Jong-Yil Chai; Korean J Parasitol 2014;52(2):193-196.
Published online April 18, 2014; DOI: https://doi.org/10.3347/kjp.2014.52.2.193

Abstract
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Fascioliasis is a zoonotic infection caused by Fasciola hepatica or Fasciola gigantica. We report an 87-year-old Korean male patient with postprandial abdominal pain and discomfort due to F. hepatica infection who was diagnosed and managed by endoscopic retrograde cholangiopancreatography (ERCP) with extraction of 2 worms. At his first visit to the hospital, a gallbladder stone was suspected. CT and magnetic retrograde cholangiopancreatography (MRCP) showed an intraductal mass in the common bile duct (CBD) without proximal duct dilatation. Based on radiological findings, the presumed diagnosis was intraductal cholangiocarcinoma. However, in ERCP which was performed for biliary decompression and tissue diagnosis, movable materials were detected in the CBD. Using a basket, 2 living leaf-like parasites were removed. The worms were morphologically compatible with F. hepatica. To rule out the possibility of the worms to be another morphologically close species, in particular F. gigantica, 1 specimen was processed for genetic analysis of its ITS-1 region. The results showed that the present worms were genetically identical (100%) with F. hepatica but different from F. gigantica.

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Nuno Vale, Maria João Gouveia, Fátima Gärtner, Paul J Brindley
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Original Articles

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; Korean J Parasitol 2014;52(1):51-56.
Published online February 19, 2014; DOI: https://doi.org/10.3347/kjp.2014.52.1.51

Abstract
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The prevalence of helminthic infections was surveyed on a total of 6,178 residents (males 2,549 and females 3,629) in 102 villages of 9 provinces in Lao PDR between 2007 and 2011 under the project of Korea-Laos Collaborative Project for Control of Foodborne Trematode Infections in Lao PDR. Fecal specimens were collected and examined by the Kato-Katz thick smear and Stoll's egg counting techniques. The overall liver/intestinal helminth egg positive rate was 71.9% with a single or mixed infections with Opisthorchis viverrini and minute intestinal flukes (Ov/MIF), Ascaris lumbricoides, hookworms, Trichuris trichiura, Trichostrongylus sp., echinostomes, Taenia spp., and others. Ov/MIF revealed the highest prevalence (55.6%) followed by hookworms (27.8%) and T. trichiura (6.5%). The endemic regions with the highest prevalence of Ov/MIF were Savannakhet, Khammouane, Vientiane (Nam Ngum), Champasak (Khong Island), and Saravane Province. High prevalences of A. lumbricoides (33.8%), hookworms (47.8%), and T. trichiura (32.6%) were observed in Phongsaly, Luang Prabang, and Vientiane (Nam Ngum) areas, respectively. The results of this study highlight helminth parasites of current public health significance in different areas of Lao PDR.

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Survey for zoonotic liver and intestinal trematode metacercariae in cultured and wild fish in An Giang Province, Vietnam: Nguyen Diem Thu, Anders Dalsgaard, Ly Thi Thanh Loan, K. Darwin Murrell; Korean J Parasitol 2007;45(1):45-54.
Published online March 20, 2007; DOI: https://doi.org/10.3347/kjp.2007.45.1.45

Abstract
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Although Vietnam has a high risk of fishborne zoonotic trematode (FZT) infections for humans, little information exists on the epidemiology of these infections in the country's fish. Because of the importance of cultured catfish and snakehead production in An Giang province, a major production area in the Mekong Delta of Vietnam, a survey for FZTs was carried out in randomly selected fish farms between June 2005 and March 2006. For comparison, wild fish from the same area were also surveyed. A total of 852 cultured fish from 4 districts were collected and examined by pepsin digestion to determine their FZT infection status. In Tra catfish, the prevalence of all types of metacercariae was 2.6%, of which the prevalence of Haplorchis pumilio was 0.7%. The overall prevalence of metacercariae in wild fish was 30.6%, of which 10.3% harbored zoonotic species: H. pumilio (2.8%) and Procerovum sp. (5.6%). The prevalence of Opisthorchis metacercariae, which were diagnosed as O. viverrini, was 1.9%. No metacercariae were found in cultured snakehead fish, although wild-caught snakehead fish had a FZT prevalence of 10.3%: 5.1% were O. viverrini; 2.6% H. pumilio; and 2.6% were Procerovum sp. These are the first reports of H. pumilio, Procerovum sp., and O. viverrini metacercariae in Vietnamese fish. These results indicate that consumption of improperly prepared fish represents a significant risk of acquiring FZTs in this south Vietnam region.

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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
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Brief Communications

Susceptibility of experimental animals to reinfection with Clonorchis sinensis: Woon-Mok Sohn, Hongman Zhang, Min-Ho Choi, Sung-Tae Hong; Korean J Parasitol 2006;44(2):163-166.
Published online June 20, 2006; DOI: https://doi.org/10.3347/kjp.2006.44.2.163

Abstract
PDF

The present study observed the resistance to reinfection with Clonorchis sinensis in various experimental animals including mice, guinea pigs, rabbits, and dogs, as well as rats and hamsters. The resistance rates to reinfection in rats, mice, hamsters, guinea pigs, rabbits, and dogs were 79.7%, 58.0%, -12.6%, 54.8%, 62.6%, and 6.0%, respectively. Worms recovered from reinfected rats and mice were immature, and significantly smaller than those from the primarily infected (P < 0.01), whereas those from other animals were fully matured to adults. These findings indicate that the protective response against reinfection with C. sinensis is prominent in rats and mice, and that they may be a good animal model to investigate the mechanism of resistance to reinfection with C. sinensis.

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Clonorchis sinensis metacercarial infection in the pond smelt Hypomesus olidus and the minnow Zacco platypus collected from the Soyang and Daechung Lakes: Jae-Hwan Park, Sang-Mee Guk, Tae-Yun Kim, Eun-Hee Shin, Aifen Lin, Ji-Yeon Park, Jae-Lip Kim, Sung-Tae Hong, Jong-Yil Chai; Korean J Parasitol 2004;42(1):41-44.
Published online March 20, 2004; DOI: https://doi.org/10.3347/kjp.2004.42.1.41

Abstract
PDF

The pond smelt Hypomesus olidus and minnow Zacco platypus were collected from the Soyang and Daechung Lakes in January 2003, and their metacercarial infections was examined by the muscle compression and artificial digestion techniques. In the Soyang Lake, 161 metacercariae of Clonorchis sinensis (0.35 per fish) were harvested from 459 pond smelts examined. Also, 13 metacercariae of C. sinensis (0.43 per fish), 1 of Metagonimus sp., 4 of Echinostoma sp., 148 of Centrocestus armatus and 44 unidentified species were collected from 30 minnows. In the Daechung Lake, 369 metacercariae of C. sinensis (3.69 per fish) and 51 unidentified species were recovered from 100 pond smelts. The metacercariae of C. sinensis were fed to experimental rats, in which the adult flukes were identified. The pond smelts and minnows collected from the Soyang and Daechung Lakes were verified to be the second intermediate hosts and the sources of human C. sinensis infection.

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Mini Review

Trematodes of the family Opisthorchiidae: a minireview: Sandie King, Tom?? Scholz; Korean J Parasitol 2001;39(3):209-221.
Published online September 30, 2001; DOI: https://doi.org/10.3347/kjp.2001.39.3.209

Abstract
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Examination of the original descriptions of genera placed within the family Opisthorchiidae has revealed that only 33 of the original 43 genera are valid members of this family. Further study of these descriptions should also reveal that many of the subfamilies are also invalid. With reference to the original descriptions of these genera, and subsequent literature, a brief survey of the family has been compiled. Information on the spectrum of definitive hosts that these helminths parasitize is provided, as well as information on the life cycles, geographic distribution, and socioeconomic impacts of the family. More in-depth information is given on those species that are of particular medical importance; namely, Clonorchis sinensis, Opisthorchis viverrini, and O. felineus. The final aims of this review are to provide information on the entire genera of the family Opisthorchiidae, which will aid understanding of the phylogenetic relationships not only within the family, but also within the Class Trematoda.

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