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Korean J Parasitol > Volume 11(1):1973 > Article

Original Article
Korean J Parasitol. 1973 Apr;11(1):26-32. English.
Published online Mar 20, 1994.  http://dx.doi.org/10.3347/kjp.1973.11.1.26
Copyright © 1973 by The Korean Society for Parasitology
Changing pattern of Clonorchis sinensis infection among school children in the Gumho basin, Kyungpook Province, Korea
Dong Wik Choi,Chong Yoon Joo,Sung Deok Park and Jae Woun Kim
Department of Parasitology, Kyungpook National University, School of Medicine, Taegu, Korea.

A study was required to evaluate the prevalence of clonorchiasis among school children in the 7 differnet schools located near the Gumho basin and to determine the effectiveness of the anticlonorchis campaign conducted in that area. Surveys for Clonorchis sinensis and the worm burden in the same areas were compared for the period 1960-1970.

Both surveys concentrated on children in grades 1-3 ranging from 6-11 years old. They were examined using primarily intradermal tests with Clonorchis antigen and followed by stool examinations. Stool examinations consisting of the formalin-ether sedimentation (Ritchie, 1948) and the Stoll egg-count techniques were performed in those cases which revealed positive and doubtful intradermal reactions.

The overall prevalence rate for clonorchiasis was reduced from 13.4 per cent to 4.1 per cent. There was also a significant reduction in the worm burden, suggesting that no clonorchiasis will be found among chileren in the near future.

In connection with this survey, the prevalence rate for intestinal helminths in 1960 was compared with 1970. The rate for Ascaris lumbricoides had decreased, while the rates for Trichuris trichiura and Trichostrongylus species had increased. No fluctuation in the rate of hookworm was observed during the past 10 years.

Clearly, the present survey denotes a requirement for a combined procedure of health education and mass survey with intradermal testing. It has been found that these methods not only greatly reduce the prevalence of clonorchiasis but also is followed by the marked reductions of the worm burdens of the children examined.


Table 1
Comparison of Clonorchis prevalence by school in the 6-11 year age group of children living near the Kumho basin in 1960 and 1970

Table 2
Comparison of Clonorchis prevalence by sex and age in the children in 1960 and 1970, with t-value for each age

Table 3
Comparison of distribution of Stoll egg-counts among school children in 1963 and 1970

Table 4
Comparison of intestinal helminth prevalences by sex and parasite in the 6-11 year age group of the children living near the Kumho basin in 1960 and 1970

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