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KMID : 0311219760070010003
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Yonsei Reports on Tropical Medicine
1976 Volume.7 No. 1 p.3 ~ p.16
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Prevalences of Clonorchiasis and Metagonimiasis along Rivers in Jeonra-Nam-Do, Korea
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Soh, C.T./소진탁
Lee, K.T./Cho, K.M./Ahn, Y.K./Kim, S.J./Chung, P.R./Im, K.I./이근태/조기목/안영겸/김상준/정평림/임경일
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Abstract
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Prevalence studies on human host and intermediate hosts of Clonorchis sinensis were done along Yeongsan-River and Seomjin-River in Jeonra-Nam-Do. In both areas, same study on Metagonimus yokogawai was also performed. The period was July-September, 1975 and July-August 1976. In both areas, there were no clear-cut prevalence difference in age distribution. However, male group showed 2-3 times higher prevalences of both Clonorchis sinenis and Metagonimus yokogazeai than in female group.
From Yeongsan-River:
1. Overal prevalence of the Clonorchis sinensis infection along the river was 105(29. 2%) out of 359 examined. By area, 21.1% in downstream, 38.5% in middle and 29.9 % in upper.
2. Cercarial prevalences of the Clonorchis sinensis among Parafossarulus manchouricus examined were, 11(1.1%) out of 980 : none in down stream, 0.9% in middle stream and 1.8% in upper stream.
3. Metacercaria of the Clonorchis sinensis was detected from five species of freash water fishes. Among them, the highest rete, 62.9%, was found from Pseudorasbora parva.
4. No Metagonomus yokogawai positive case was found.
5. No carcaria of Metagonimus yokogawai was found from 179 examined.
6. No Plecoglossus altivelis was caught from along the river.
From Seomjin-River:
7. Egg positives for Clonorchis sinensis were found 21(7.1%) out of 295 exanimed, and for Metagonimus yokogawai 123(41.6%) from the same number. By area, Clonorchis 8. 8% and Metagonimus 44.0% in down stream, Clonorchis 7.4% and Metagonimus 58.0% in middle and Clonorchis 5.6% and Metagonimus 29.0% in upper.
8. Parafossarulus manchouricus was collected from middle portion of the river, but cercaria of Clonorchis was not found.
9. Among 663 Semisulcospira libertina collected, 62(9.4%) were the cercarial positives of Metagonimus yokogawai.
10. No fresh water fish had metacercaria of Clcnorchis sinensis.
11. Plecoglossus altivelis contained metacercaria of Metagonimus yokogawai in 100% among the total examined.
Through above findings, it is concluded that Yeongsan-River area is the endemic for Clonorchis sinensis, but not Metagonimus yokogawai, and Seomjin-River area is the endemic for both Clonorchis sinensis and Metagonimus yokogawai, though the latter is more prevalent.
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