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Infestation status of Paragonimus westermani metacercariae in the second intermediate host in Ulchin county, Kyungpook Province
Young Ae Hong,Chong Yoon Joo and Young Sik Pyun**
Department of Parasitology and Orthopaedic Surgery**, Keimyung University,School of Medicine, Taegu, Korea.
Abstract
A study on the population density of crayfish intermediate hosts and infestation status of crayfish with encysted larvae of Paragonimus westermani in Ulchin county, Kyungpook province, Korea was conducted from May to October in 1986. The population density of the crayfish ranged from 1 to 13, with an average of 4 per manhour. Among the six habitats, Ducheon had a somewhat higher density than that of the others. Of eight hundred and seventeen crayfish examined, 127 or 15.5 per cent harboured the metacercarial larvae of Paragonimus westermani. The majority of the larvae were found in three parts of the body: most frequently in the cephalothorax, next in the gills, and then in the liver. The average number of metacercarial larvae per infected crayfish ranged from 1.0 to 1.9, with an average of 1.7. Summarizing the results, this study indicates that the population density of crayfish intermediate host and infestation rates for the crayfish with encysted larvae of Paragonimus westermani in Ulchin county of Kyungpook province is relatively high.
Tables
Table 1 Population density of crayfish in six localities un Ulchin county, Kyungpllk Province, Korea (1986), together with environmental conditions
Table 2 Infestation rates from Paragonimus metacercaria from crayfish in Ulchin county, Kyungpook Province, Korea(1986)
Table 3 Demonstration rates of encysted larvae of P. westermani from the body parts of infected crayfish(1986)
Table 4 Numerical distribution of P. westermani from metacercariae in the body parts of crayfish(1986)
Table 5 The reported infestation rates of crayfish intermediated hosts with Paragonimus metacercariae in Korea
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