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Geographical distribution of the lung fluke, Paragonimus westermani-diploid type (Trematoda, Troglotrematidae) in the northern part of Okayama Prefecture, Japan



Geographical distribution of the lung fluke, Paragonimus westermani-diploid type (Trematoda, Troglotrematidae) in the northern part of Okayama Prefecture, Japan



Biogeography 6: 87-93



The lung fluke, Paragonimus westermani-diploid type is one of the causative agents of human paragonimiasis. In order to study the distribution of this parasite in northern part of Okayama Prefecture, a total of 2,156 freshwater crabs, Geothelphusa dehaani, were collected from 48 different locations in Atetsu-, Maniwa-, Tomata-, Katsuta-, Aida-gun, Tsuyama City and Niimi City. Among these, 51 crabs from 10 locations (Tanami, Notoro, Shiogama, Higashi, Bessho, Ichinokaya, Kouti, Ishigoshi, Kuramihigashi and Ohsugi) in Maniwa-and Tomata-gun bordering Tottori Prefecture were positive for Paragonimus metacercariae. The infection rate for each location varied from 2.5% to 34.2%. A total of 144 metacercariae were obtained from these crabs and they were morphologically identical to each other. Four metacercariae from Notoro were inoculated into a cat and three adult worms were recovered from this cat. On the basis of their morphological characteristics, these adult worms were identified as Paragonimus westermani-diploid type.

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