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Korean J Parasitol > Volume 23(1):1985 > Article

Original Article
Korean J Parasitol. 1985 Jun;23(1):102-110. English.
Published online Mar 20, 1994.  http://dx.doi.org/10.3347/kjp.1985.23.1.102
Copyright © 1985 by The Korean Society for Parasitology
Epidemiological survey of Paragonimus westermani in Ulchin County, Kyungpook Province, Korea
Chong Yoon Joo,Sung Hoon Ahn,** and Young Choon Park***
Department of Parasitology, Keimyung University School of Medicine, Taegu, Korea.
**Department of Internal Medicine, Keimyung University School of Medicine, Taegu, Korea.
***Department of Neurology, Keimyung University School of Medicine, Taegu, Korea.
Abstract

In order to determine the epidemiological pattern of the Paragonimus westermani, the infestation rates of the cercarial and metacercarial larvae of digenetic trematodes in the snail and crayfish host, and the prevalence of Paragonimus westermani among the residents in the vicinity of the stream Namdae, Wyangpi, and Kwang, in the Ulchin county, Kyungpook province were studied from March to October in 1984. The population density of the snails per square meter of the habitats ranged form 5 to 25, with average of 15. Among the seven habitats, one, Ducheon, had snails infested with the cercariae of Paragonimus westermani, and the proportion of infested snails was very low, the average being 0.152 per thousand. Of six hundred and four crayfish examined, 113 or 18.7 per cent harboured the encysted larvae of Paragonimus westermani. A high infestation rate for the metacercariae in the crayfish was found in two habitats; 39.0 per cent in the Ducheon and 21.6 per cent in the Sokwang. The prevalence of Paragonimus westermani among the residents in Ulchin county was relatively high, 25.8 per cent by the Paragonimus intradermal tests and the difference in the rate of infection between males and females was found to be significant(t>2). The results obtained in this study indicate that endemic foci of Paragonimus westermani exist in Ulchin county and the prevalence of this lung fluke among the residents is relatviely high.

Figures


Fig. 1
Surveyed areas in Ulchin(Uljin) county in Kyungpook Province, Korea.

Tables


Table 1
Environmental conditions at surveyed areas in Ulchin county, Kyungpook Province(1984)


Table 2
Snail population density and infestation rates for Paragonimus cercaria from Semisulcospira libertina caught in habitats in Ulchin county(1984)


Table 3
Demonstration of Paragonimus metacercaria from crayfish in surveyed areas in Ulchin county (1984)


Table 4
Prevalence of Paragonimus westermani among residents in seven different villages in the vicinity of streams in Ulchin county, revealed by Paragonimus intradermal test (1984)


Table 5
Prevalence of Paragonimus westermani by sex and age group among residents in Ulchin county, Kyungpook Province, revealed by intradermal test (1984)


Table 6
Comparison of detection rates for P. westermani eggs by means of sputum and stool examinations (1984)

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