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Studies on the geographical distribution of the lung fluke, Paragonimus westermani (Kerbert, 1878) in the southern Prefectures of the Kinki district, Japan: observations on the incidence of metacercariae of P. westermani in Geothelphusa dehaani in Uda area, Nara Prefecture



Studies on the geographical distribution of the lung fluke, Paragonimus westermani (Kerbert, 1878) in the southern Prefectures of the Kinki district, Japan: observations on the incidence of metacercariae of P. westermani in Geothelphusa dehaani in Uda area, Nara Prefecture



Japanese Journal of Parasitology 331: 7-14



During the period from Oct., 1979 to April, 1982, the freshwater crab, G. dehaani, the 2nd intermediate host of the lung fluke, P. westermani, was collected at 27 different localities in Uda area of Nara Prefecture Japan . Of 1732 crabs captured at 7 localities, which include Takaboshi, Takidani, Nishitani, Ryuguchi, Zenigatani, Kairo and Kamigoh, 267 (15.4%) harbored Paragonimus metacercariae. The highest (29.2%) incidence was found in Kairo and the lowest (0.6%) at Kamigoh; 843 metacercariae of the lung fluke were obtained from these 267 crabs. The number of metacercariae/positive crab ranged from 1-27 with an average of 3.2. No metacercaria was found in 2186 crabs at the remaining localities. Based on the morphological features of the metacercariae, the adult worms and the eggs recovered from the experimental cats, the worms were all identified as the bisexual type of P. westermani (Kerbert, 1878) as proposed by Miyazaki. Uda area of Nara Prefecture was added as a new prevarent locality of P. westermani in Japan.

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