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

Original Article
Korean J Parasitol. 1983 Dec;21(2):157-166. English.
Published online Mar 20, 1994.  http://dx.doi.org/10.3347/kjp.1983.21.2.157
Copyright © 1983 by The Korean Society for Parasitology
Epidemiological studies of Clonorchis sinensis in Mangyeong riverside areas in Korea
Jae Ku Rhee,Byeong Kirl Baek,Sang Bork Lee and Hong Bum Koh
Department of Veterinary Medicine, Jeonbug National University, Korea.
Abstract

In an attempt to clarify the epidemiological feature of C. sinensis in Mangyeong riverside area, the prevalence of clonorchiasis, infestation rate of the cercariae in Parafossarulus manchouricus, and detection rate of the metacercariae in fresh-water fishes were investigated from March 1 to September 30, 1983 at the upper, middle and lower reaches of the river. The results obtained were summarized as follows:

1. Detection rate of C. sinensis egg among inhabitants was 8.2% out of a total of 1,266 persons. but the differences in detection rates were not statistically signifcant among upper, middle and 1ower reaches. According to sex, the detection rates were 10.3% in male and 6.1% in female (p<0.05), but by age groups, increases of the rates were observed as increase in age (p<0.05).

2. Out of a total of 380 fresh-water fishes of 32 different species, 93 fishes (25%) of 12 species were found positive with Clonorchis metacercariae, and there were differences in infection rates of the metacercariae among the fishes in 3 parts of the river; 11% in upper, 35% in middle, and 34% in lower reaches respectively. The metacercarial detection rates from various fishes were 97% in Pseudorasbora parva, Cultriculus eigenmanni (85%), Gnathopogon strigatus (67%), Microphysogobio yaluensis (50%), Gnathopogon coreanus (47%), Pungtungia herzi(44%), Abbottina rivularis (40%), Moroco oxycephalus (33%), Coreoleuciscus splendidus (32%), Gnathopogon majimae (26%), Rhodeus ocellatus (7%), and Aphyocypris chinensis (3%) respectively.

3. Although very few P. manchouricus were collected at upper reach, 12 snails (0.7%) among a total of 1,713 were found infected with Clonorchis cercariae. Also the cercariae of Echinochasmus japonicus (7.99%), Lexogenes liberum (0.99 percent), Cyathocotyle orientalis (0.75%), Exorchis oviformis (0.23%) and Asymphylodora japonica (0.05%) were detected from the snails.

Figures


Fig. 1
The areas where the snails, fishes and stool specimens were collected.

Abbreviations; 1: Samgi-Ri, Kosan Myon 2: Ubne-Ri, Kosan Myon 3: Eowoo-Ri, Kosan Myon 4: Ha-Ri, Samye Eup 5: Yougang-Ri, Baeggu Myon 6: Baeggu-Ri, Baeggu Myon 7: Mogcheon-Dong, Iri City 8: Osarn-Ri, Osarn Myon 9: Namjeon-Ri, Osarn Myon 10: Singy-Ri, Osarn Myon 11: Kwangkyo-Ri, Daeya 12: Sarnwerl-Ri, Daeya Myon


Tables


Table 1
Infection rates of digenetic trematode cercariae from Parafossarulus manchouricus in Mangyeong riverside area


Table 2
Environmental factors of various water system of Mangyeong riverside*


Table 3
Infestation rates for Clonorchis sinensis metacercariae from fresh-water fishes caught in Mangyeong riverside area


Table 4
Density of Clonorchis sinensis metacercariae from fresh-water fishes in upper reach


Table 5
Density of Clonorchis sinensis metacercariae from fresh-water fishes in middle reach


Table 6
Density of Clonorchis sinensis metacercariae from fresh-water fishes in lower reach


Table 7
Density of Clonorchis sinensis metacercariae from fresh-water fishes in Mangyeong riverside area


Table 8
Egg positive rates of Clonorchis sinensis among inhabitants in Mangyeong riverside area


Table 9
Egg positive rates of Clonorchis sinensis in upper reach inhabitants of Mangyeong riverside area


Table 10
Egg positive rates of Clonorchis sinensis in middle reach inhabitants of Mangyeong riverside area


Table 11
Egg positive rates of Clonorchis sinensis in lower reach inhabitants of Mangyeong riverside area


Table 12
Distribution of Clonorchis sinensis eggs per gram of feces in Mangyeong riverside inhabitants


Table 13
Egg positive rates of *helminths in Mangyeong riverside inhabitants

References
1. Shin DS. [Epidemiological studies of Clonorchis sinensis prevailed in the peoples of Kyungpook Province]. Korean J Parasitol 1964;2(1):1–13.
 
2. Ito J. Progress of Medical Parasitology in Japan 1964;1:397–550.
3. Komiya Y. Progress of Medical Parasitology in Japan 1965;2:1–328.
4. Rhee JK, Baek BK, Ahn BZ, Park YJ. [The Wormicidal Substances Of Fresh Water Fishes On Clonorchis Sinensis: I Preliminary Research On The Wormicidal Substance From Mucous Substance Of Carassius Carassius]. Korean J Parasitol 1979;17(2):121–126.
 
5. Rhee JK, Baek BK, Ahn BZ, Park YJ. [The Wormicidal Substances Of Fresh Water Fishes On Clonorchis Sinensis: II. Preliminary Research On The Wormicidal Substances From Mucous Substances Of Various Fresh Water Fishes]. Korean J Parasitol 1980;18(1):98–104.
 
6. Seo BS, et al. Korean J Parasit 1981;19:137–150.
 
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