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