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Epidemiological studies of digenetic trematodes in Yongyang County, Kyungpook Province
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Korean J Parasito > Volume 29(4):1991 > Article

Original Article
Korean J Parasitol. 1991 Dec;29(4):325-338. English.
Published online Mar 20, 1994.  http://dx.doi.org/10.3347/kjp.1991.29.4.325
Copyright © 1991 by The Korean Society for Parasitology
Epidemiological studies of digenetic trematodes in Yongyang County, Kyungpook Province
D I Chung,Y I Kim,*K R Lee,* and D W Choi
Department of Parasitology, Kyungpook National University School of Medicine, Taegu, Korea.
Abstract

The present study was undertaken to determine the endemicity of trematode infections in Yongyang County, Kyungpook Province, Korea.

One hundred and seventy-seven out of 955 residents examined were found to be infected with one or more kinds of helminths. The prevalence rate was 18.5%. Among them, 70 were found to be infected with Clonorchis sinensis, 74 with Metagonimus sp. and 24 with both flukes. The eggs of Fasciolidae were demonstrated from two specimens. The prevalence rate of clonorchiasis in males was 12.6%, while that in females was 3.6% (p < 0.05). The prevalence of metagonimiasis in males was 12.0% and was also significantly higher than 6.1% in females (p < 0.05). The intensity of both infections was significantly heavier in males than in females. The prevalence of both flukes was higher in residents of over 30 years of age than in those below that age. No correlation was found between the intensity and the age group.

Among eight species of the fresh-water fish collected at the Panbyon River, Zacco temmincki was found to be the most frequently and heavily infested with metacercariae of Metagonimus sp., and Gnathopogon atromaculatus alone was found to be infested with metacercariae of Clonorchis sinensis.

The present results suggest that Yongyang area still remains endemic with Clonorchis sinensis and Metagonimus sp. infection.

Figures


Fig. 1
Map of Yongyang County, Kyungpook Province, showing the river Panbyon and its tributaries.


Fig. 2
Intensity of infection with C. sinensis by sex and age groups.


Fig. 3
Intensity of infection with Metagonimus sp. by sex age groups.


Fig. 4
Association of intensity of C. sinensis infection in residents with infestation of fish host by area.


Fig. 5
Association of intensity of Metagonimus sp. infection in residents with infestation of fish host by area.


Fig. 6
Relationships between EpG count by Stoll's method and count by a modified method.

Tables


Table 1
Prevalence of helminthic infection among 955 residents of Yongyang county, Kyungpook Province, Korea(1990)


Table 2
Prevalence of Clonorchis sinensis infection in Yongyang county by sex and age groups(1990)


Table 3
Prevalence of Metagonimus sp. infection in Yongyang county by sex and age groups(1990)


Table 4
Sex and age groups related to intensity of infection with C. sinensis based on Stoll's egg counting method among residents(1990)


Table 5
Sex and age groups related to intensity of infection with Metagonimus sp. based on Stoll's egg counting method among residents(1990)


Table 6
Distribution of intensity of infection with C. sinensis among residents by sex and age groups


Table 7
Distribution of intensity of infection with Metagonimus sp. among residents by sex and age groups


Table 8
Prevalence and intensity of infection with C. sinensis according to administrative districts of Yongyang county(1990)


Table 9
Prevalence and intensity of infection with Metagonimus sp. according to administrative districts of Yongyang county(1990)


Table 10
Fresh water fish collected in the Panbyon river, Yongyang County(1990)


Table 11
Incidence and intensity of infestation with C. sinensis and Metagonimus sp. metacercariae in fresh-water fish collected in the river Panbyon(1990)


Table 12
Rate and intensity of infestation with C. sinensis metacercariae from G. atromaculatus by locality


Table 13
Rate and intensity of infestation with Metagonimus sp. metacercariae from Z. temmincki by locality

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