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Korean J Parasitol > Volume 16(1):1978 > Article

Original Article
Korean J Parasitol. 1978 Jun;16(1):1-13. English.
Published online Mar 20, 1994.  http://dx.doi.org/10.3347/kjp.1978.16.1.1
Copyright © 1978 by The Korean Society for Parasitology
Epidemiological study on Metagonimus yokogawai infection along Boseong River in Jeonra Nam Do, Korea
Chin-Thack Soh and Yung-Kyum Ahn
Institute of Tropical Medicine and Department of Parasitology, College of Medicine, Yonsei University, Korea.

Prevalence study of Metagonimus yokogawai infection, survey of intermediate hosts of Metagonimus yokogawai and food habits of raw sweetfish among inhabitants along Boseong river (120 km), Jeonra Nam Do (province) were carried out.

The results are summarized as follows:

1. Among 360 examined, the egg positive case were 128(35.6%); male 112(46.7%), female 16(13.3%).

2. The prevalence rates were different by geographical areas; 42.4% in down stream, 49.4% in middle stream and 13.3% in upper stream.

3. By ages, highest rate, 53.6-59.1% was observed among 30-49 group (male 69.6-73.0%, female 15.8-35.5%).

4. Eggs per gram of feces were 2,084 (200-12,280) in average; down stream 1,708, middle stream 2,590, upper stream l,550.

5. By social strata, the prevalence showed differences; 24.8% in primary schoolchildren, 78.4% in school teacher and local officers, 30.6% in general inhabitants.

6. Clonorchis sinensis infected cases in the areas were 21(5.8%) out of 360 examined, and 90.5% of them showed mixed infection with Metagonimus yokogawai.

7. Cercariae of Metagonimus yokogawai from the lst intermediate host, Semisulcospira sp., in down and middle streams were detected from 32 snails (5.9%) out of 545 examined.

8. All the 22 Plecoglossus altivelis which were caught from the down stream were infected with metacercariae of Metagonimus yokogawai. The number of the metacercariae detected was 22,650 per fish in average, and the number increased from August to October.

9. Experiences of raw sweetfish intake of the inhabitants were found in 208(58.4%) among 356 interviewed by questionaire form (male 76.7%, female 20.7%).

10. Means of acquisition of the sweetfish were mostly by purchase 68.8%, and seasonally in summer.

11. Reason of the raw sweetfish intake was due to the flavor, 83.2%. The fish were mixed in soy sause with vinegar before the intake.


Fig. 1
Surveyed areas along Boseong river in Jeonra Nam Do.


Table 1
Prevalences of helminths in surveyed regions along Boseong-river, Jeonra Nam Do (Stool examination by fromalin-ether concentration technique)

Table 2
Regional comparison of positive rates of Metagonimus yokogawai along Boseong-river by sex

Table 3
Prevalence of Metagonimus yokogawai along Boseong-river area by age and sex

Table 4
Prevalence of Metagonimus yokogawai infection by social strata in surveyed region along Boseong-river

Table 5
Regional prevalence of Clonorchis sinensis along Boseong-river area by sex

Table 6
Intensity of Metagonimus yokogawai infection among inhabitants along Boseong-river

Table 7
Cercarial positives of Metagonimus yokogawai in Semisulcospira snails along Boseong-river

Table 8
Monthly metacercarial density of Metagonimus yokogawai in sweetifish (Plecoglossus altivelis) which were collected form down stream of Boseong-river

Table 9
Eationg habit of Sweetfish (Plecoglossus altivelis) among Metagonimus yokogawai positive cases in surveyed frgions (down & middle stream)

Table 10
Means of acquisitions of sweetfish in surveyed regions

Table 11
Seasonal frequency and the number of chance to eat sweetfish in raw condition in a year (down & middle stream)

Table 12
Reasons and using condiments in eation sweetfish under raw condition

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