Epidemiological studies of <i>Clonorchis sinensis</i> in vicinity of river Taewha, Kyungnam province, Korea

, Joo, Chong Yoon

doi:1980.18.2.199

Korean J Parasito > Volume 18(2):1980 > Article

Original Article


Korean J Parasitol. 1980 Dec;18(2):199-214. English. Published online Mar 20, 1994. http://dx.doi.org/10.3347/kjp.1980.18.2.199
Copyright © 1980 by The Korean Society for Parasitology


Epidemiological studies of Clonorchis sinensis in vicinity of river Taewha, Kyungnam province, Korea
Chong-Yoon Joo
Department of Parasitology, Graduate School, Kyungpook National University, Taegu, Korea.


Abstract
In order to determine the epidemiological patten of the liver fluke, Clonorchis sinensis, the locality where the snail, Parafossarulus manchouricus, is abundant, the infestation rates for the cercarial and metacercarial larvae of digenetic trematodes in the snail and fish hosts, and the prevalence of Clonorchis sinensis among the residents in the vicinity of river Taewha, Kyungnam Province, Korea were studied from March 1979 to September 1980. Four snail habitats were found in the river Taewha. The population density of the snail per square meter of the habits ranged from 10 to 500, with an average of 150. Among the 4 snail habitats, three, Baek-cheon, Sa-yeon and Taewha had snails infected with the cercaria of Clonorchis sinensis, and the proportion of infested snails in the three habitats was very low, the average being 0.59 per thousand. Four species of fresh-water fish, the bullhead, Coreobagrus brevicorpus, the Korean shiner, Gnathopogon atromaculatus, the flat bitterling, Paracheilognathus rhombea, and the striped shiner, Pungtungia herzi among ten species of fish examined harbored the metacercaria of Clonorchis sinensis. The intensity of infestation with the cyst of Clonorchis sinensis in the four species of fish was low. The approximate number of the cysts per gram of flesh was between 3.5 in Paracheilognathus rhombea and 21.5 in Gnathopogon atromaculatus. Seven kinds of laval tremathodes, Clonorchis sinensis, Cyathocotyle orientalis, Echinochasmus species, Exorchis oviformis, Metacercaria hasegawai, Metagonimus yokogawai and Metorchis orientalis were found from ten species of fish examined. In general, the infestation rates for the encysted larvae of digenetic trematodes varied from fish to fish. The infection rate for Clonorchis sinensis among the residents in the vicinity of river Taewha was relatively high, 22.2 percent by the formalin-ether sedimentation technique, and the difference in the rate of infection between males and females found to be siginificant(t>2). Of these, the rate was 12.4 per cent in 483 elementary school children and 17.7 percent in 761 middle and high school students. The results obtained in the present study indicate that endemic foci of Clonorchis sinensis exist in the river Taewha and the prevalence of the liver fluke among the residents is still high.

Figures


	Fig. 1 Study areas in the vicinity of the river Taewha, Kyungnam Province, Korea.

LEGENDS FOR FIGURES
1. Snail, Parafossarulus manchouricus caught in River Taewha.

2. Microphotograph and drawing of C. sinensis cercaria from P. manchouricus.

3~9. Metacercariae detected form fresh-water fish caught in the River Taewha.

3. Cyathocotyle orientalis

4. Echinochasmus species

5. Exorchis oviformis

6. Metacercaria hasegawai

7. Metagonimus yokogawai

8. Metorchis orientalis

9. C. sinensis

Tables


	Table 1 Habitats and population density of snail, Parafossarulus manchouricus in river Taewha, Kyungnam Province, Korea (1980)


	Table 2 Infestation rates of Parafossarulus manchouricus with Clonorchis cercaria in river Taewha, Kyungnam Province, Korea(1980)


	Table 3 Demonstration of Clonorchis sinensis metacercaria from fresh-water fish in river Taewha, Kyungnam Province, Korea (1980)


	Table 4 Infestation density of Clonorchis metacercaria in 4 kinds of fresh-water fish(1980)


	Table 5 Infestation rates for encysted larvae of digenetic trematodes in flesh of fish(1980)


	Table 6 Infestation rates for encysted larvae of digenetic trematodes on scales of fish(1980)


	Table 7 Infestation rates for encysted larvae of digenetic trematodes on fins and tail of fish(1980)


	Table 8 Prevalence of Clonorchis sinensis based on formalin-ether sedimentation technique among elementary school children (1980)


	Table 9 Prevalence of Clonorchis sinensis among middle and high school students (1980)


	Table 10 Prevalence of Clonorchis sinensis among residents in vicinity of river Taewha, Kyungnam Province, Korea(1980)


	Table 11 Intensity of Clonorchis sinensis infections based on Stoll's egg-count among residents in vicinity of river Taewha, Kyungnam Province(1980)

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