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Epidemiological studies on the lung fluke in shizuoka prefecture japan 2. discovery of a fresh water snail saganoa sp as a 1st intermediate snail host of paragonimus miyazakii

, : Epidemiological studies on the lung fluke in shizuoka prefecture japan 2. discovery of a fresh water snail saganoa sp as a 1st intermediate snail host of paragonimus miyazakii. Japanese Journal of Parasitology 28(4): 211-218

The prevalence of the metacercaria of P. miyazakii among the crab, Potamon dehaani, and the occurrence of natural final mammalian hosts of this lung fluke in Shizuoka Prefecture were reported by Yokogawa et al. (1974), Hayashi et al. (1974), Ito et al. (1975) and Sano et al. (1978). The natural snail host of this fluke was not found in this prefecture until 1978. From July-Nov. 1978, many small freshwater snails belonging to the genus Saganoa Kuroda et Habe (1958) Hydrobiidae were discovered at Dojima, Kawane-cho, one of the endemic areas of P. miyazakii in the prefecture. The habitat of this snail is mainly sandy soil in the shady subterranean water areas of ravines. The snail examination for larvae of P. miyazakii revealed that 6 of the 648 snails, or 0.9%, harbored rediae and 4 of the 648, or 0.6%, were positive for cercariae. The number of rediae or cercariae in each infected snail was very low, being 1-3 rediae or 1-7 cercariae. In the other endemic areas of P. miyazakii in the southwestern prefectures of Japan, only 1 genus of snail, Bythinella (Moria), belonging to Hydrobiidae, the same family of the genus Saganoa, was a natural snail host of P. miyazakii [Hatsushika et al. (1966), Hashiguchi (1967), and Habe et al. (1971)]. The 1st intermediate snail host of P. miyazakii in Shizuoka Prefecture is Saganoa sp., and this snail is another genus of natural snail host of P. miyazakii, following the initial genus Bythinella (Moria). Dr. Tadashige Habe, a conchologist in the National Museum of Science in Tokyo, identified this snail as a new species, Saganoa kawanensis.

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