Korean J Parasitol.  2011 Dec;49(4):385-398. 10.3347/kjp.2011.49.4.385.

Prevalence of Clonorchis sinensis Metacercariae in Freshwater Fish from Three Latitudinal Regions of the Korean Peninsula

Affiliations
  • 1Division of Malaria and Parasitic Diseases, National Institute of Health, Centers for Disease Control and Prevention, Osong 363-951, Korea.
  • 2Department of Parasitology and Institute of Health Sciences, Gyeongsang National University School of Medicine, Jinju 660-751, Korea. wmsohn@gnu.ac.kr
  • 3Department of Parasitology and Inha Research Institute for Medical Sciences, Inha University College of Medicine, Incheon 400-712, Korea.
  • 4Department of Molecular Parasitology, Sungkyunkwan University School of Medicine, Center for Molecular medicine, Samsung Biomedical Research Institute, Suwon 440-746, Korea.
  • 5Department of Parasitology and Medical Research Institute, Chungbuk National University College of Medicine, Cheongju 360-763, Korea.
  • 6Infection Disease Intelligence Division, Gangwon Institute of Health and Environment, Chuncheon 200-822, Korea.

Abstract

A large-scale survey was conducted to investigate the infection status of fresh water fishes with Clonorchis sinensis metacercariae (CsMc) in 3 wide regions, which were tentatively divided by latitudinal levels of the Korean peninsula. A total of 4,071 freshwater fishes were collected from 3 regions, i.e., northern (Gangwon-do: 1,543 fish), middle (Chungcheongbuk-do and Gyeongsangbuk-do: 1,167 fish), and southern areas (Jeollanam-do, Ulsan-si, and Gyeongsangnam-do: 1,361 fish). Each fish was examined by the artificial digestion method from 2003 to 2010. In northern areas, only 11 (0.7%) fish of 2 species, Pungtungia herzi and Squalidus japonicus coreanus from Hantan-gang, Cheolwon-gun, Gangwon-do were infected with av. 2.6 CsMc. In middle areas, 149 (12.8%) fish were infected with av. 164 CsMc. In southern areas, 538 (39.5%) fish were infected with av. 159 CsMc. In the analysis of endemicity in 3 regions with an index fish, P. herzi, 9 (6.2%) of 146 P. herzi from northern areas were infected with av. 2.8 CsMc. In middle areas, 34 (31.8%) of 107 P. herzi were infected with av. 215 CsMc, and in southern areas, 158 (92.9%) of 170 P. herzi were infected with av. 409 CsMc. From these results, it has been confirmed that the infection status of fish with CsMc is obviously different among the 3 latitudinal regions of the Korean peninsula with higher prevalence and burden in southern regions.

Keyword

Clonorchis sinensis; metacercaria; freshwater fish; prevalence; latitudinal level

MeSH Terms

Animals
Clonorchiasis/epidemiology/parasitology/*veterinary
Clonorchis sinensis/*isolation & purification
Fish Diseases/*epidemiology/parasitology
Fishes
Fresh Water
Korea/epidemiology
Metacercariae
Prevalence
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