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Korean J Parasitol > Volume 17(1):1979 > Article

Original Article
Korean J Parasitol. 1979 Jun;17(1):51-59. English.
Published online Mar 20, 1994.  http://dx.doi.org/10.3347/kjp.1979.17.1.51
Copyright © 1979 by The Korean Society for Parasitology
Epidemiological conditions of Metagonimus yokogawai infection in Hadong Gun, Gyeongsang Nam Do
Dong-Chan Kim,On-Young Lee,Eui-Beom Jeong and Eui-Jung Han
Division of Parasitology, National Institute of Health, Seoul, Korea.
Abstract

An epidemiological investigation was conducted on Metagonimus yokogawai infection in Hadong Gun (County), Gyeongsang Nam Do, Korea, and following findings were obtained.

1. Overall prevalence rate of Metagonimus yokogawai infection was 29.1 percent from a total of 1,163 inhabitants examined. By area of river and stream, Seomjin-gang R.: 9.5 percent (out of 95 inhabitants examined) in Jeondo Ri in the lower river, 19.9 percent (156) at Dugog Ri near Hadong town, and 90.8 percent (65) in Tab Ri of Hwagae Myeon where Hwagae-cheon Stream joins; Hwagae-Cheon Stream: 42.2 percent (45) in Yonggang Ri of the middle stream and 27.5 percent (72) in Daeseong Ri of the upper stream; Hoengcheon-gang R.: 54.7 percent (161) in Gojeol Ri of the lower river, 40.6 percent (128) in Hoengcheon Ri of the middle stream, and 5.4 percent (93) in Jungi Ri of the upper stream, and 43.8 percent (89) in Uge Ri located along a tributary of the Hoengcheon-gang R. and 4.0 percent (101) in Jangam Ri which is located about 4 km away from the river; Deogcheon-gang R.: 18.5 percent (54) in Munam Ri; Gwangog-cheon Stream: 2.8 percent (107) in Gwangog Ri.

2. The difference in prevalence rate of the infection by area was correlated with the opportunity and amount of raw eating of sweetfish by the inhabitants in the respective areas.

3. By age and sex, the overall prevalence rate increased from young age group and reached a peak at 20-29 age group and then the rate decreased gradually. In high endemic areas, however, a peak level of the rate lasted up to 40-49 age group in male. On the other hand, in low endemic areas, the rate was significantly lower in female, though moderate level of the infection was seen in male. The overall prevalence rate was higher in male than in female and the difference was greater in middle age groups.

4. The most significant mode of infection by the inhabitants was the raw eating of sweetfish which commonly harbour metacercariae of M. yokogawai during summer through autumn. Besides, it was noted that the infection can be acquired through contamination with the metacercariae on food of various side-dish and kitchen utensils as well as on hands of a cook when such fish are prepared or handled.

5. The inhabitants usually begin to acquire infection from early June of a year when fishing of sweetfish opens and acquire infection more frequently in July and August when fish are caught more productively and favored for raw consumption by inhabitants. From September, sweetfish are no more favored for raw consumption and accordingly are dried and cooked in this season.

6. The infection in the sweetfish Plecoglossus altivelis as the second intermediate host was first observed from May with low level of infection and the intensity of infection in a fish rapidly increased until reaching a peak in October when sweetfish season normally ends.

7. The first intermediate host snail of M. yokogawai in this area was Semisulcospira coreana (Martens) which is widely distributed in the streams and rivers in this locality.

Figures


Fig. 1
Area of investigation.


Fig. 2
Prevalence of Metagonimus yokogawai infection among inhabitants in the areas of high endemicity over 40% (upper) and of low endemicity less than 40% (lower) by age and sex.

Tables


Table 1
Prevalence of helminth infection among inhabitants by area (%)


Table 2
Prevalence of Metagonimus yokogawai infection among inhabitants by area


Table 3
Prevalence of Metagonimus yokogawai infection among inhabitants by age and sex


Table 4
Intensity of Metagonimus yokogawai infection among positives by area


Table 5
Intensity of Metagonimus yokogawai infection among positives by age and sex


Table 6
Intensity of Metagonimus yokogawai infection in fish and snail host

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. Choi DW, Lee JT, Hwang HK, Shin YD. [Studies Of The Larval Trematodes From Brackish Water Fishes: 2. Observation On Metagonimus Yokogawai Katsurada, 1912]. Korean J Parasitol 1966;4(1):33–37.
 
3. Seo BS, Hong NT. Study On Metagonimus Yokogawai(Katsurada, 1912) In Korea: I. On The Metacercaria, Its Distribution In The Second Intermediate Host And The Development In The Final Host. Korean J Parasitol 1969;7(3):129–142.
 
4. Hwang JT, Choi DW. Metacercarial density of Metagonimus yokogawai in Plecoglossus altivelis in Kyungpook province, Korea. Korean J Parasitol 1977;15(1):30–35.
 
5. 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.
 
6. Seo BS, et al. Seoul J Med 1971;12(4):234–241.
7. Soh CT, et al. Yonsei Rep Trop Med 1976;7(1):3–16.
8. 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.
 
9. Yeo TO, et al. Seoul J Med 1971;12(4):259–267.
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