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Korean J Parasitol > Volume 19(2):1981 > Article

Original Article
Korean J Parasitol. 1981 Dec;19(2):137-150. English.
Published online Mar 20, 1994.  http://dx.doi.org/10.3347/kjp.1981.19.2.137
Copyright © 1981 by The Korean Society for Parasitology
An epidemiologic study on clonorchiasis and metagonimiasis in riverside areas in Korea
Byong-Seol Seo,Soon-Hyung Lee,Seung-Yull Cho,Jong-Yil Chai,Sung-Tae Hong,In-Soo Han,Jin-Saeng Sohn,Byong-Hwan Cho,Seok-Rok Ahn,Sang-Ki Lee,Sang-Choon Chung,Keun-Shik Kang,Hyong-Soo Shim and In-Soo Hwang
Department of Parasitology and Institute of Endemic Diseases, College of Medicine, Seoul National University, Korea.
The Korean Association for Parasite Eradication, Korea.
Abstract

A study was carried out to figure the cases and to observe the endemic status of clonorchiasis and metagonimiasis in endemic areas in Korea. Total 13,373 inhabitants living in 40 villages along 7 main rivers and 9 small streams were subjected to stool examination. They were selected randomly among the riverside population. Their specimens were examined both by cellphane thick smear method and Stoll's egg countung technique. This study was performed during the period from May 1979 to April 1980.

The results obtained are as follows:

1. The egg positive rate of any kind of helminths was 58.7% out of 13,373 examned cases, and the egg positive rates by each helminth were; Clonorchis sinensis 21.5%, Metagonimus yokogaqai 4.8%, large type Metagonimus eggs 0.4%, Ascaris lumbricoides 22.9%, Trichuris trichiura 35.2%, hookworm 0.2%, Taenia sp. 0.5%, Hymenolepis nana 0.07%, Paragonimus westermani 2 cases, Fasciola sp. 4 cases, Echinostoma sp. 1 case and Hymenolepis diminuta 1 case respectively.

2. Many endemic foci of clonorchiasis were revealed along the 7 major rivers. The egg positive rates of each river basin differed from each other significantly; Nagdonggang 40.2%, Yeongsangang 30.8%, Seomjingang 17.3%, Hangang 15.7%, Tamjingang 15.9%, Geumgang 12.0% and Mangyeonggang 8.0%. The cases of clonorchiasis were estimated in range 830,000 to 890,000 in riverside areas of the 7 rivers. By grading the infection intensity, 64.7% was in Grade I(EPG 0-900), 28.6% in Grade II (EPG 1000-9,900), 5.5% in Grade III (EPG 10,000-29,900) and 1.3% in Grade IV (EPG over 30,000). The proportion of the cases in Grade III and IV was 6.8% among positive cases. Therefore 60,000 cases at least were regarded to suffer from it clinically. Males of 30-60 years of age showed higher positive rate and heavier burden of infection. This makes clonorchiasis more important socially because the patients lose their social productivity.

3. A few endemic foci of metagonimiasis were detected newly by egg detection; Samcheong 28.5% egg positive rate, Uljin 21.3%, Yeuongdeog 46.3%, Milyang 6.7%, Yeongil 9.2% and Geoje 18.2%. The mean EPG values were in range of 320-7, 120 by the focus. The egg positive rate and proportion of EPG Grade varied greatly by the area, and mean proportion of the positive cases were 69.7% in Grade I, 24.1% in Grade II, 5.0% in Grade III and 1.2% in Grade IV. Males of 30-60 years were infected in higher rate also. The large sized eggs of Metagonimus were found also in upper basin of Hangang and Geumgang mainly. They were regarded as eggs of M. takahashii which is mediated by the cyprinid fishes. Its significance should be studied further.

Clonorchiasis and metagonimiasis should be realized as important public health problems in Korea by their wide distribution, high prevalence rate and heavy infection intensity. Comprehensive measures against them are needed urgently.

Figures


Fig. 1
The location and area code of the areas where stool specimens were collected

Tables


Table 1
List of subjected villages for stool examination by administrative district


Table 2
The egg positive rates of human helminths in riverside inhabitants arranged by administrative province


Table 3
Egg positive rates and EPG counts of C. sinensis by the riverside area


Table 4
Case distribution by the EPG grade of C. sinensis in each riverside


Table 5
Egg positive rates and case distribution by EPG grade of C. sinensis among riverside inhabitants by age and sex


Table 6
Egg positive rates and EPG counts of M. yokogawai by riverside area


Table 7
Case distribution by EPG grade of M. yokogawai in endemic areas, where egg positive rate was over 5%


Table 8
The egg positive rates and case distribution by EPG grade of M. yokogawai by age and sex


Table 9
Positive rates and EPG count of large type Metagonimus eggs

References
1. Chai JY, Cho SY, Seo BS. Study on Metagonimus yokogawai(Katsurada, 1912) in Korea: IV. An epidemiological investigation along Tamjin River basin, South Cholla Do, Korea. Korean J Parasitol 1977;15(2):115–120.
 
2. Cho SY, Seo BS, Kim YI, Won CK, Cho SK. [A Case Of Human Fascioliasis In Korea]. Korean J Parasitol 1976;14(2):147–152.
 
3. Chun SK. Bull Pusan Fisher Coll 1960;3(1):24–30.
4. Chung BJ, et al. Kyungpook Univ Med J 1979;20(2):207–212.
5. Kim CH. [Study on the Metagonimus sp. in Gum river basin, Chungchung-nam Do, Korea]. Korean J Parasitol 1980;18(2):215–228.
 
6. Kim DC, Lee OY, Jeong EB. [Epidemiological conditions of Metagonimus yokogawai infection in Hadong Gun, Gyeongsang Nam Do]. Korean J Parasitol 1979;17(1):51–59.
 
7. Rim HJ, et al. New Med J 1973;16(1):69–79.
8. Seo BS, et al. Seoul J Med 1980;21(1):21–29.
9. Seo BS, et al. Seoul J Med 1981;22(2):228–235.
10. Seo BS, Rim HJ, Loh IK, Lee SH, Cho SY, Park SC, Bae JW, Kim JH, Lee JS, Koo BY, Kim KS. [Study On The Status Of Helminthic Infections In Koreans]. Korean J Parasitol 1969;7(1):53–70.
 
11. Shin DS. [Epidemiological studies of Clonorchis sinensis prevailed in the peoples of Kyungpook Province]. Korean J Parasitol 1964;2(1):1–13.
 
12. Soh CT, Ahn YK. [Epidemiological Study On Metagonimus Yokogawai Infection Along Boseong River In Jeonra Nam Do, Korea]. Korean J Parasitol 1978;16(1):1–13.
 
13. Soh CT, et al. Yonsei Rep Trop Med 1976;7(1):3–16.
14. Song CY. Chung-Ang J Med 1981;6(1):121–126.
15. Walton BC, et al. Bull Wld Hlth Org 1959;21:721–726.
16. Yeo TO, et al. Seoul J Med 1971;12(4):259–267.
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