Austropeplea ollula (Pulmonata: Lymnaeidae): a new first intermediate host of Neodiplostomum seoulense(Trematoda: Diplostomatidae) in Korea

초록

Some planorbid snails such as Hippeutis hemisperula have been reported as the molluscan intermediate hosts of Neodiplostomum seoulense, one of the important snail-borne human intestinal trematodes in Korea. However, one of the Korean lymnaeid snail species, Austropeplea ollula was also found to be the first intermediate host of N. seoulese. In field-collected Austropeplea snails from Sorae and Kimpo out of seven collected localities, the bifurcated cercariae of N. seoulense were shed(infection rate: 0.3%), whereas no Radix auricularia and Fossaria truncatula were found shedding the cercariae. Each of 12 tadpoles of Rana nigromaculata, known as the second intermediate host of N. seoulense, were exposed to 200 cercariae shed from field-cllected A. ollula. Five tadpoles of R. nigromaculata were found to be massively infected with metacercariae of N. seoulense(recovery rate: 62.1%). Each of five rats(Sprague-Dawley strain) was orally fed with 200 metacercariae, and eggs of N. seoulese were detected in the rat feces one week later. These rats were killed 4 weeks after postinfection and adult worms of N. seoulense were recovered from the small intestines(recovery rate: 9%). This is the first report of A. ollula as the first molluscan intermediate host for N. seoulense in Korea.