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Parasit Host Dis > Volume 7(3):1969 > Article

Original Article
Korean J Parasitol. 1969 Dec;7(3):171-177. English.
Published online Mar 20, 1994.  http://dx.doi.org/10.3347/kjp.1969.7.3.171
Copyright © 1969 by The Korean Society for Parasitology
A study on the infection status on intermediate hosts by Paragonimus on Che Ju Island
Joung Soon Kim
Department of Epidemiology, College of Public Health, Seoul National University, Korea.

A study on the infection status of intermediate hosts of Paragonimus, snail and crab, was conducted on Che Ju Island for four years to understand ecology of Paragonimus in the area and to evalute the control program by mass chemotherapy.

The infection rate of the first intermediate host of Paragonimus, snail, showed higher rate in the area where human association was more frequent and had higher human infection rate compared with the area with lower human infection and less contact by people. Larger snails were infected more frequently than smaller ones. After the mass treatment on human population, the infection rate of snail dropped markedly in four years.

The infection rate and the intensity of infection of crabs were influenced by many factors:by frequency of human association, by prevalence of paragonimiasis in the population and volume of water flow, dilution effect. The distribution of metacercariae in infected crabs varied by body sites; the most frequently in gill, next in legs, internal organs and thoracic muscle in order. If crabs were examined for existence of metacercariae only gills, about 6% of infected crabs of may be missed as negative. The infection status of the crabs was not different by distance from the actual site of pollution. Also seasonal fluctuation of crab infection was not remakable.

The crab infection by size showed time sequence of exposure; smaller crabs had lower infection rate and metacercaria density reaching to the maximum by 3 cm of size. As shown in the snail infection, the crab infection remarkably decreased after the control measure of human paragonimiasis, mass chemotherapy, in four years.


Table 1
The infection rate of snail by study area

Table 2
Number of redia from each snail infected

Table 3
Number of microcercocercaria in redia randomy sampled

Table 4
Distribution of metacercariae in various tissues and organs, and detection rate of metacercaria by site

Table 5
Comparison of infection rate of crabs in relation to the frequency of human association for streams of Kang Chung village

Table 6
Infection rate of crabs at different distances from the site of pollution in the same stream

Table 7
The infection rate and metacercaria density of crabs by month and village

Table 8
The infection rate of crabs by size and area

Table 9
The density of metacercaria by crab size

Table 10
The infection rate of crab in relation to human infection rate

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3. Kang SY, et al. The Korean J Int Med 1964;7(4):223–228.
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6. Motomura K. End Dis Bull Nagasaki Univ 1961;3(4):299–310.
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