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Prevalence of Clonorchis sinensis in vicinity of Seongju, Kyungpook Province, Korea
Dong Wik Choi
Department of Parasitology, School of Medicine, Kyungpook National University, Korea.
Abstract
An epidemiological survey conducted from March 1977 to October 1978, revealed that in the river Taeka running through Seong-ju county, Kyungpook Province, one habitat of the snail, Parafossarulus manchouricus, was found. The snail population in the habitat was very low, and no Clonorchis sinensis cercaria was found in the snails examined.
Seven species of fresh-water fish caught were examined for the presence of the metacercaria of Clonorchis sinensis. Of these, 3 species of fish, the Korean shiner, Gnathopogon atromaculatus, the gudgeon, Pseudogobio esocinus, and the striped shiner, Pungtungia herzi harbored the encysted larvae. The rate and intensity of infection with the metacercaria in the fish was, on the whole, low. The prevalence of Clonorchis sinensis among the residents in Seong-ju county was alsolow. The overall infection rate for the fluke in 1,012 residents was found to be 13.4 per cent. The infection rate for Clonorchis sinensis in males and females was 17.1 and 9.2 per cent, respectively. This difference was statistically significant (t > 2).
It is found that Clonorchis sinensis is less prevalent in Seong-ju county than in the other counties of Kyungpook Province, Korea.
Figures
Fig. 1 Map of study area in Kyungpook Province, Korea.
Fig. 2 The upper stream of river Taeka in Seongju county(Jun), Kyungpook Province, Korea.
Tables
Table 1 Demonstration of Clonorchis metacercariae from fresh-water fish caught in vicinity of river Taeka running through Seongju county, Kyungpook Province, Korea(1978)
Table 2 Density of Clonorchis metacercariae in 3 species of fresh-wather fish caught in river Taeka(1978)
Table 3 Prevalence of Clonorchis sinensis among residents in Seongju county, Kyungpook Province(1978)
Table 4 Intensity of Clonorchiasis among residents in Seongju area by Stooll's egg-counts
Table 5 Comparison of intestinal helminth prevalence by Formalin-ether sedimentation technique among residents in Kyungpook Province, in 1960, 1973 and present survey
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