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Korean J Parasitol > Volume 20(2):1982 > Article

Original Article
Korean J Parasitol. 1982 Dec;20(2):133-141. English.
Published online Mar 20, 1994.  http://dx.doi.org/10.3347/kjp.1982.20.2.133
Copyright © 1982 by The Korean Society for Parasitology
Epidemiological studies of Clonorchis sinensis in lower area of Nag Dong river nearby Busan City in Korea
Soo Bok Song
College of Medicine, Busan National University, Busan, Korea.

The infection rates with cercaria and metacercaria of the Clonorchis sinensis in snail and fish hosts, and the prevalence among the inhabitants in the lower Nag Dong river in Busan were investigated in the period from June 1981 to March 1982. The stool examination and E.P.G. count for prevalence and intensity of clonorchiasis were done by cellophane thick smear and Stoll's egg count methods.

The prevalence rate of clonorchiasis among inhabitants of 3 towns in Bug Gu, was 38.4% among a total of 1,384 persons examined.

By town, the prevalence in Gu Po was 25.4% out of 330 persons examined, 39.3% in 438 examined in Gang Dong and 44.8% out of 616 in examined in Myeng Ji respectively. According to sex, the male(41.9%) showed relatively higher rate than female(35.3%). By age, increase of rate was observed as increase in age. The highest rate was 80.7% in 50-59 years group.

The intensity of infection was light: 89.1% of examined cases were below 10,000 E.P.G. ; by area 80.9%(Gu Po), 80.2%(Gang Dong), 97.3%(Myeng JI).

Out of fresh water fish species collected, 2 species were not infected with metacercaria. The metacercarial detection rate from fish in low Nag Dong river showed 100% in Pseudorasbora parva, Pseudogobio esocinus(41.4%), Hemibarbus labeo(37.1%), Acheilognathus limbata(33.3%) and Erythroculter erthropterus(4.5%) respectively. The mean number of metacercaria per gram of muscle was 21.2 in P. parva, P. esocinus(15.0), H. labeo(11.9), A. limbata(6.3), and E. erythropterus(1.6) respectively.

Though 7 area along Nag Dong river were surveyed for Parafossarulus manchouricus, the snails were not found at all areas except for one area, Seo Nam stream; and the cercaria was infected 0.9% out of 708 examined.


Fig. 1
Map of localities surveyed.


Table 1
Prevalence of clonochiasis among inhabitants in Gu Po Dong by age and sex

Table 2
Prevalence of clonochiasis among inhabitants in Gang Dong by age and sex

Table 3
Prevalence of clonochiasis among inhabitants in Myeng ji Dong by age and sex

Table 4
Prevalence of clonochiasis among inhabitants in Bug Gu by age and sex(a total of Tables 1,2,3)

Table 5
Intensity of Clonorchis infection in Gu Po Dong inhabitants

Table 6
Intensity of Clonorchis infection in Gang Dong inhabitants

Table 7
Intensity of Clonorchis infection in Myeng ji Dong inhabitants

Table 8
Intensity of Clonorchis infection in Bug Gu inhabitants(a total of Tables 5,6 & 7)

Table 9
Demonstration of Clonorchis metacercaria from fish in lower Nag Dong river

Table 10
Intensity of Clonorchis metacercaria in fish

Table 11
Infection rates of Clonorchis cercaria in Parafossarulus manchouricus of survey areas

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