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

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

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Infection characteristics of Metagonimus species (Digenea: Heterophyidae) metacercariae in fish from major rivers of Korea
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Current status of Clonorchis sinensis and clonorchiasis in Korea: epidemiological perspectives integrating the data from human and intermediate hosts
Won Gi Yoo, Woon-Mok Sohn, Byoung-Kuk Na
Parasitology.2022; 149(10): 1296. CrossRef

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Original Articles

Hypolobocera guayaquilensis (Decapoda: Pseudothelphusidae): A New Crab Intermediate Host of Paragonimus mexicanus in Manab? Province, Ecuador: Manuel Calvopina, Daniel Romero-Alvarez, Melina Rendon, Hidekazu Takagi, Hiromu Sugiyama; Korean J Parasitol 2018;56(2):189-194.
Published online April 30, 2018; DOI: https://doi.org/10.3347/kjp.2018.56.2.189

Abstract
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To determine that Paragonimus sp. is actively transmitted in a tropical area of the Pacific region of Ecuador where human cases of pulmonary paragonimiasis have recently been documented, a total of 75 freshwater crabs were collected from 2 different streams in the Pedernales area of Manab? Province, Ecuador. All collected crabs were identified as Hypolobocera guayaquilensis based on morphological characteristics of the male gonopods. The hepatopancreas of each crab was examined by compressing it between 2 glass plates followed by observation under a stereomicroscope. Excysted Paragonimus metacercariae were detected in 39 (52.0%) crabs and their densities varied from 1 to 32 per infected crab. There was a positive relationship between crab size and metacercarial density. Sequences of the second internal transcribed spacer region of the ribosomal RNA gene of the Paragonimus metacercariae obtained in this study were identical to those of Paragonimus mexicanus deposited in the DDBJ/EMBL/GenBank database. Thus, the present study is the first to confirm that the crab species H. guayaquilensis is the second intermediate host of P. mexicanus in Manab? Province, Ecuador. Because this crab might be the possible source of human infections in this area, residents should pay attention to improper crab-eating habits related with a neglected parasitic disease, i.e., paragonimiasis.

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Jong-Yil Chai, Bong-Kwang Jung
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Liver fluke infections by Amphimerus sp. (Digenea: Opisthorchiidae) in definitive and fish intermediate hosts in Manabí province, Ecuador
Daniel Romero-Alvarez, Gabriela Valverde-Muñoz, Manuel Calvopina, Maira Rojas, William Cevallos, Hideo Kumazawa, Hidekazu Takagi, Hiromu Sugiyama, jong-Yil Chai
PLOS Neglected Tropical Diseases.2020; 14(6): e0008286. CrossRef

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Echinostoma revolutum: Freshwater Snails as the Second Intermediate Hosts in Chiang Mai, Thailand: Kittichai Chantima, Jong-Yil Chai, Chalobol Wongsawad; Korean J Parasitol 2013;51(2):183-189.
Published online April 25, 2013; DOI: https://doi.org/10.3347/kjp.2013.51.2.183

Abstract
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The occurrence of 37-collar spined echinostome metacercariae in freshwater snails was investigated in 6 districts of Chiang Mai Province, Thailand, from October 2011 to April 2012. A total of 2,914 snails that belong to 12 species were examined, and 7 snail species (Clea helena, Eyriesia eyriesi, Bithynia funiculata, Bithynia siamensis siamensis, Filopaludina doliaris, Filopaludina sumatrensis polygramma, and Filopaludina martensi martensi) were found infected with echinostome metacercariae. The prevalence of metacercariae was the highest in Filopaludina spp. (38.5-58.7%) followed by B. funiculata (44.0%), E. eyriesi (12.5%), B. siamensis siamensis (8.2%), and C. helena (5.1%). Metacercariae were experimentally fed to hamsters and domestic chicks, and adult flukes were recovered from both hosts at days 15 and 20 post-infection. The adult flukes were identified based on morphological features, morphometrics, host-parasite relationships, and geographical distribution. They were compatible to Echinostoma revolutum or Echinostoma jurini, with only minor differences. As the adults were recovered from both hamsters and chicks, our specimens were more compatible to E. revolutum rather than E. jurini (reported only from mammals). This is the first report for metacercariae of E. revolutum in the snail host, C. helena, and also confirmed that Filopaludina spp., E. eryresi, and Bithynia spp. act as the second intermediate hosts of E. revolutum under natural conditions, which are indigenously distributed in Chiang Mai province.

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Nithinan Chomchoei, Chalobol Wongsawad, Preeyaporn Butboonchoo, Nattawadee Nantarat
Asian Pacific Journal of Tropical Medicine.2024; 17(12): 536. CrossRef
Morphological and DNA analyses reveal cryptic diversity in Anentome wykoffi (Brandt, 1974) (Gastropoda: Nassariidae), with descriptions of two new species from Thailand
Nithinan Chomchoei, Thierry Backeljau, Piyatida Pimvichai, Ting Hui Ng, Nattawadee Nantarat, Gonzalo Giribet
Invertebrate Systematics.2023; 37(11): 755. CrossRef
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Pichit Wiroonpan, Thapana Chontananarth, Jong-Yil Chai, Watchariya Purivirojkul
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A. Stanicka, R. Maciaszek, A. Cichy, J. Templin, W. Świderek, E. Żbikowska, A. M. Labecka
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Echinostoma mekongi: Discovery of Its Metacercarial Stage in Snails, Filopaludina martensi cambodjensis, in Pursat Province, Cambodia
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Brief Communication

Discovery of Larval Gnathostoma nipponicum in Frogs and Snakes from Jeju-do (Province), Republic of Korea: Ho-Choon Woo, Hong-Shik Oh, Shin-Hyeong Cho, Byoung-Kuk Na, Woon-Mok Sohn; Korean J Parasitol 2011;49(4):445-448.
Published online December 16, 2011; DOI: https://doi.org/10.3347/kjp.2011.49.4.445

Abstract
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A survey was performed to find out the intermediate hosts of Gnathostoma nipponicum in Jeju-do (Province), the Republic of Korea. In August 2009 and 2010, a total of 82 tadpoles, 23 black-spotted pond frogs (Rana nigromaculata), 7 tiger keelback snakes (Rhabdophis tigrinus tigrinus), 6 red-tongue viper snakes (Agkistrodon ussuriensis), and 2 cat snakes (Elaphe dione) were collected in Jeju-do and examined by the pepsin-HCl digestion method. Total 5 gnathostome larvae were detected in 3 (50%) of 6 A. ussuriensis, 70 larvae in 3 of 7 (42.9%) R. tigrinus tigrinus, and 2 larvae in 2 of 82 (8.7%) frogs. No gnathostome larvae were detected in tadpoles and cat snakes. The larvae detected were a single species, and 2.17×0.22 mm in average size. They had characteristic head bulbs, muscular esophagus, and 4 cervical sacs. Three rows of hooklets were arranged in the head bulbs, and the number of hooklets in each row was 29, 33, and 36 posteriorly. All these characters were consistent with the advanced third-stage larvae of G. nipponicum. It has been first confirmed in Jeju-do that R. nigromaculata, A. ussuriensis, and R. tigrinus tigrinus play a role for intermediate and/or paratenic hosts for G. nipponicum.

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Meiqi Weng, Xinhua Liu, Chenxi Zhang, Rui Shu, Andrew Wang, Haotian Zhang, Xingqiang Wang, Huirong Yang, Jinyong Zhang
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Tommy L. F. Leung
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Doo Sik Park, Eun Hyun Cho, Kyung Hoon Park, Soo Min Jo, Bumjung Park, Sun Huh
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Seongjun Choe, Junsik Lim, Hyun Kim, Youngjun Kim, Heejong Kim, Dongmin Lee, Hansol Park, Hyeong-Kyu Jeon, Keeseon S. Eom
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The Korean Journal of Parasitology.2013; 51(3): 343. CrossRef

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Original Article

Indochinamon ou (Crustacea: Potamidae) as a New Second Intermediate Host for Paragonimus harinasutai in Luang Prabang Province, Lao PDR: Woon-Mok Sohn, Jae-Sook Ryu, Duk-Young Min, Hyun-Ouk Song, Han-Jong Rim, Youthanavanh Vonghachack, Daluny Bouakhasith, Virasack Banouvong; Korean J Parasitol 2009;47(1):25-29.
Published online March 12, 2009; DOI: https://doi.org/10.3347/kjp.2009.47.1.25

Abstract
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Paragonimus harinasutai metacercariae were found in a species of freshwater crab, Indochinamon ou, collected in a small stream of Namback District, Luang Prabang Province, Lao PDR. Adult flukes were recovered after experimental infection of the metacercariae to dogs. Metacercariae were round or slightly elliptical, 0.666 × 0.626 mm in average size, and had a thin cyst wall of about 20 ?m in thickness, a black excretory bladder, convoluted ceca, and some pinkish materials in the body. Adults were somewhat elongated, 95.2 × 36.5 mm in average size, covered with single-tipped tegumental spines, had a smaller oral sucker than the ventral sucker, a moderately branched ovary, and 5-6 lobulated testes. Eggs were ovoid and bilaterally symmetrical in shape, 79 × 45 ?m in average size, and had a uniformly thickened shell. By the present study, it has been confirmed that I. ou is a new second intermediate host for P. harinasutai.

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Considerable genetic diversity within Paragonimus heterotremus in Luang Prabang, northern Lao People's Democratic Republic
Alongkorn Nonthapa, Rutchanee Rodpai, Tongjit Thanchomnang, Patcharaporn Boonroumkaew, Lakkhana Sadaow, David Blair, Pewpan M. Intapan, Wanchai Maleewong, Virasack Banouvong, Sakhone Laymanivong, Oranuch Sanpool
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Kethmany Ratsavong, Fabrice Quet, Fulgence Nzabintwali, Jeoffray Diendéré, Jacques Sebert, Michel Strobel, Yves Buisson
Parasite Epidemiology and Control.2017; 2(1): 1. CrossRef
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Oranuch Sanpool, Pewpan Maleewong Intapan, Tongjit Thanchomnang, Penchom Janwan, Sakhone Laymanivong, Hiromu Sugiyama, Wanchai Maleewong
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Brief Communications

Two species of goby, Boleophthalmus pectinirostris and Scartelaos sp., as the new second intermediate hosts of heterophyid fluke in Korea: Woon-Mok Sohn, Jung-A Kim, Hyun-Jae Song; Korean J Parasitol 2005;43(4):161-164.
Published online December 20, 2005; DOI: https://doi.org/10.3347/kjp.2005.43.4.161

Abstract
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A survey was performed in order to determine the infection status of the metacercariae of heterophyid fluke in two goby species, Boleophthalmus pectinirostris and Scartelaos sp., collected from Gangjin-gun, and Shinan-gun, Sooncheon-shi, Jeollanam-do, Republic of Korea. A total of three metacercariae of Heterophyopsis continua was found in only one B. pectinirostris (10.0%) from Gangjin-gun. Heterophyes nocens metacercariae were detected in 24 B. pectinirostris (96.0%) and 14 Scartelaos sp. (63.6%) from Shinan-gun. Heterophyopsis continua metacercariae were found in 11 B. pectinirostris (44.0%) and 21 Scartelaos sp. (95.5%) from Shinan-gun. Stictodora fuscata metacercariae were detected in 18 B. pectinirostris (72.0%) from Shinan-gun. No metacercariae were detected in 20 B. pectinirostris from Sooncheon-shi. From the above results, this study is the first to prove that B. pectinirostris and Scartelaos sp. serve as the second intermediate hosts of some heterophyid flukes in Korea.

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Infections with Zoonotic Trematode Metacercariae in Yellowfin Goby, Acanthogobius flavimanus, from Coastal Areas of Republic of Korea
Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Jung-Won Ju, Soon-Won Lee, Won-Seok Seok
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
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Rodney A. Bray, Jean-Lou Justine
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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 Zoonotic Trematode Metacercariae in the Republic of Korea
Woon-Mok Sohn
The Korean Journal of Parasitology.2009; 47(Suppl): S103. CrossRef
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
The Korean Journal of Parasitology.2006; 44(1): 7. CrossRef

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Identification of Acanthotrema felis (Digenea: Heterophyidae) metacercariae encysted in the brackish water fish Acanthogobius flavimanus: Woon-Mok Sohn, Eun-Taek Han, Min Seo, Jong-Yil Chai; Korean J Parasitol 2003;41(2):101-105.
Published online June 20, 2003; DOI: https://doi.org/10.3347/kjp.2003.41.2.101

Abstract
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The metacercariae of Acanthotrema felis Sohn et al., 2003 (Digenea: Heterophyidae) were discovered in a species of the brackish water fish, Acanthogobius flavimanus, in the Republic of Korea. They were experimentally fed to kittens, and adult flukes were harvested 7 days later. The adults were morphologically characterized by the presence of a bipartite seminal vesicle, the ventral sucker associated with a ventrogenital sac enclosing 3 sclerites (2 long and pointed, and 1 short and thumb-like), and an unarmed gonotyl. The adult flukes were identified as A. felis Sohn et al., 2003, and the brackish water fish A. flavimanus has been verified as one of its second intermediate hosts.

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Infection status of Paragonimus westermani metacercariae in crayfish (Cambaroides similis) collected from Bogildo (Islet), Wando-gun, Chollanam-do, Korea: Myeong-Heon Shin, Duk-Young Min; Korean J Parasitol 1999;37(1):55-57.
Published online March 31, 1999; DOI: https://doi.org/10.3347/kjp.1999.37.1.55

Abstract
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During the period from October 1996 to November 1998, the infection status of Paragonimus westermani metacercariae in freshwater crayfish (Cambaroides similis) collected from Bogildo (islet), Wando-gun, Chollanam-do, which is known for an endemic area of P. westermani in Korea, were examined. The average infection rate of Paragonimus metacercariae in crayfish was 88.6%, and mean number of metacercariae per infected crayfish was 30.2. This metacercarial density was the highest in the group of weight in 7.1-9.0 g. These results suggest that the natural life cycle of P. westermani is still well-preserved in Bogildo.

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