Epidemiological studies on <i>Clonorchis sinensis</i> infection along the Nam-river in Gyeongnam province, Korea

, Bae, Kyoung Hoon; , Ahn, Yung Kyum; , Soh, Chin Thack; , Tsutsumi, Hiroshi

doi:1983.21.2.167

Korean J Parasito > Volume 21(2):1983 > Article

Original Article


Korean J Parasitol. 1983 Dec;21(2):167-186. English. Published online Mar 20, 1994. http://dx.doi.org/10.3347/kjp.1983.21.2.167
Copyright © 1983 by The Korean Society for Parasitology


Epidemiological studies on Clonorchis sinensis infection along the Nam-river in Gyeongnam province, Korea
Kyoung-Hoon Bae,Yung-Kyum Ahn,^*Chin-Thack Soh and Hiroshi Tsutsumi
Instiutue of Tropical Medicine, Yonsei University, Seoul, Korea.
^*Wonju Medical College, Yonsei University, Kangwon-do, Korea.
Kurume University, School of Medicine, Japan.


Abstract
The prevalence of C. sinensis infection along the Nam river, Korea, was 38.7% of 5,291 people examined. Prevalence rates varied from 42% at the upper stream to 34% at the middle stream and 40% at the down stream region. Rates were highest (53.4-54.3%) in the 30-59 years of age group. The positive rates in primary school chidren, school students, teachers and local officers, and other inhabitants were 16.5%, 22.6%, 46.2% and 49.6% respectively. 53.6% of cases were light infected, i.e. less than 4,000/EPG. The cercarial expulsion rate of 5,005 Parafossarulus sp. was 0.34%. Snails naturally infected with C. sinensis expelled about 788 cercariae/day. Ten of 18 species of freshwater fish examined had C. sinensis metacercariae. To prevent clonorchiasis in the endemic areas, the effective health education system is suggested as a control measure.

Figures


	Fig. 1 Surveyed regions of the Nam-river.


	Fig. 2 Comparison of infected intensity by EPG of Clonorchis sinensis according to sex.


	Fig. 3 Prevalence and intensity of Clonorchis sinensis infections by sex and age.


	Fig. 4 Pathological observation of Parafossarulus snail infected with Clonorchis sinensis and Loxogenes liberum. 1. Liver tissue of snail infected with C. sinensis. 2. Higher magnification of the No. 1. 3. Infected with Loxogenes liberum. 4. Higher magnification of the No. 3.


	Fig. 5 Expelled cercariae of Clonorchis sinensis from naturally infected Parafossarulus snail in a day.

Tables


	Table 1 Regional comparison of positive rates of Clonorchis sinensis by sex along the Nam-river, Gyeongnam Province


	Table 2 Regional prevalences of helminths in area along the Nam-river, Gyeongnam Province, Korea


	Table 3 Prevalence of Clonorchis sinensis infection by sex and age along the Nam-river, Gyeongnam Province


	Table 4 Prevalence of Clonorchis sinensis infection by social strata in surveyed regions along the Nam-river, Gyeongnam Province


	Table 5 Prevalence of Clonorchis sinensis infection by administrative district (Gun=County) along the Nam-river, Gyeongnam Province


	Table 6 Infected intensity by EPG count of Clonorchis sinensis along the Nam-river, Gyeongnam Province


	Table 7 EPG distribution of Clonorchis sinensis infections by sex and age among inhabitants in area along the Nam-river, Gyeongnam Province


	Table 8 Regional intensity of Clonorchis sinensis infection by EPG count among inhabitants in area along the Nam-river, Gyeongnam Province


	Table 9 Comparison of positive rates of Clonorchis sinensis and Metagonimus yokogawai along the Nam-river area


	Table 10 Distribution of Parafossarulus manchouricus snail and cercarial incidence of Clonorchis sinensis along the Nam-river in Gyeongnam Province


	Table 11 Expelled cercariae of Clonorchis sinensis from naturally infected Parafossarulus snail in a day


	Table 12 Mean number of expelled cercariae of Clonorchis sinensis from Parafossarulus snails


	Table 13 Kinds of expelled cercariae from Parafossarulus snails infected with trematodes


	Table 14 Comparison of expelled cercariae of various trematodes from naturally infected Parafossarulus snails in 5 days


	Table 15 Detection rate of Clonorchis metacercaria in the fresh-water fishes caught (or purchased) along the Nam-river area


	Table 16 Metacercarial density of Pseudorasbora parva caught at the Jinyang lake side

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