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Korean J Parasitol > Volume 22(2):1984 > Article

Original Article
Korean J Parasitol. 1984 Dec;22(2):161-170. English.
Published online Mar 20, 1994.  http://dx.doi.org/10.3347/kjp.1984.22.2.161
Copyright © 1984 by The Korean Society for Parasitology
Epidemiological studies on Metagonimus yokogawai infection in Samcheok-gun, Kangwon-do, Korea
Yung-Kyum Ahn
Department of Parasitology, Wonju Medical College, Yonsei University, Korea.
Abstract

An epidemiological study on Metagonimus yokogawai infection was performed in Samcheok-gun, Kangwon province during the period from November 1983 to October 1984.

Formalin-ether concentration technique and Stoll's dilution egg counting method were employed to figure out the prevalence and infection intensity of M. yokogawai infection. The results are summarized as follows:

1. The prevalence of M. yokogawai infection was 13.3% among 1,172 examined ; 18.0% (114 out of 632) in male and 7.8% (42 out of 540) in female.

2. The prevalence rates were different by stream; 15.5% in Ohsip-chon (stream), 11.8% in Maeup-chon and 1.6% in Gagok-chon.

3. Along the basin of Oship-chon; 8.2% at the lower reaches in Samcheok-eup, 25.9% at the middle reaches in Miro-myon and 6.2% at the upper reaches in Dogeoe-eup, respectively.

4. By age group, the highest rate (18.3-20.2%) was observed in 30-49 years of age (male : 24.1-28.7%, female 11.2-13.2%).

5. By social strata, the positive rate was 15.0% (120 out of 799) in general inhabitants and 9.7% (36 out of 373) in school children.

6. Intensity by EPG count in feces was 419 in average; the light infection (less than 400 EPG) was 70.4%, moderate infection (401-1,000 EPG) 19.4% and heavy infection (more than 1,001 EPG) 10.2% respectively.

7. All the 67 sweetfish (length 10.3-18.5 cm) which were caught from Ohsip-stream were infected with metacercariae of M. yokogawai and the number of metacercariae detected were 382 per fish in average (323 in June and 382 in September).

8. Experiences of intake of raw fresh-water fish [Plecoglossus altivelis and Leuciscus (Tribolodon) sp.] were present in 50.3% (354 out of 704) of the inhabitants along Ohsip-stream according to questionnaire study.

The results of this survey indicated that the middle reaches of Ohsip-stream in Miro-myon, Samcheok-gun is the endemic region for M. yokogawai infection.

Figures


Fig. 1
Surveyed regions in Samcheok-gun, Kangwon Province.

Tables


Table 1
Regional comparion of infection rates of Metagonimus yokogawai by sex in Sancheok-gun, Kangwon Province


Table 2
Prevalence of intestinal helminths in Samcheok-gun, Kangwon Province


Table 3
Prevalence of Metagonimus yokogawai infection in Samcheok-gun area by sex and age


Table 4
Prevalence of Metagonimus yokogawai infection by social strata in Samcheok-gun area


Table 5
Infected intensity by EPG count of Metagonimus yokogawai infection in Samcheok-gun area by age


Table 6
Metacercarial prevalence of Metagonimus yokogawai from sweetfish (P. altivelis) caught (or purchased) along Ohsip-stream in Samcheok-gun


Table 7
Metacercarial density of Metagonimus yokogawai from sweetfish which were collected form Ohsip-stream


Table 8
Eating habit of Plecoglossus altivelis and Leuciscus (Tribolodon) sp. in Miro-myon and Samcheok-eup along Ohsip stream, samcheol-gun


Table 9
Kinds of fishes eaten under raw condition among inhabitants along Ohsip-stream in Samcheok-gun according to questionnaire


Table 10
Means of acquisitions of fishes among inhabitants along Ohsip-stream in Samcheok-gun according to questionnaire


Table 11
Reasons and suing condiments in eating under raw condition by questionnaire among inhabitants along Ohsip-steeam in Samcheok-Gun

References
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