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Comparative studies on susceptibilities of two different Japanese isolates of Oncomelania nosophora to three strains of Schistosoma japonicum originating from Japan, China, and the Philippines

  • M. KIRINOKI (a1), M. HU (a1) (a2), H. YOKOI (a1), S. KAWAI (a1), R. TERRADO (a3), E. ILAGAN (a3), Y. CHIGUSA (a1), Y. SASAKI (a1) (a4) and H. MATSUDA (a1)...

Abstract

Oncomelania nosophora (Gastropoda: Pomatiopsidae) is the intermediate host of Schistosoma japonicum in Japan. Although most of the snails were eliminated during the 20th century, they are still found in two areas in Japan. One area is in the Kofu Basin, including Nirasaki City, in Yamanashi Prefecture. The other is the Obitsu River Basin in Kisarazu City, Chiba Prefecture. Snails collected in Nirasaki and Kisarazu were exposed to 3 geographical strains of S. japonicum originating from Japan, China, and the Philippines. Both isolates of O. nosophora showed high susceptibility to the Japanese strain of S. japonicum (74·0%–82·2% for the Nirasaki isolate and 58·0%–56·0% for the Kisarazu isolate) and low susceptibility to the Chinese strain (0·0%–1·3% and 1·4%–7·9% respectively). In contrast, the susceptibility of the snails to the Philippine strain was significantly different (P<0·01) between the isolates (3·3%–6·6% for the Nirasaki isolate and 31·9%–75·9% for the Kisarazu isolate). To examine the differences in infectivity in detail, we conducted histological observations of snails exposed to the Philippine strain at 3 h, 1, 3, and 15 days after miracidial exposure. We found differences in the development of the parasite between the isolates of snails from early after exposure.

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Corresponding author

Department of Tropical Medicine and Parasitology, Dokkyo University School of Medicine, Mibu, Shimotsuga, Tochigi 321-0293, Japan. Tel: +81 282 87 2134. Fax: +81 282 86 6431. E-mail: hmatsuda@dokkyomed.ac.jp

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Keywords

Comparative studies on susceptibilities of two different Japanese isolates of Oncomelania nosophora to three strains of Schistosoma japonicum originating from Japan, China, and the Philippines

  • M. KIRINOKI (a1), M. HU (a1) (a2), H. YOKOI (a1), S. KAWAI (a1), R. TERRADO (a3), E. ILAGAN (a3), Y. CHIGUSA (a1), Y. SASAKI (a1) (a4) and H. MATSUDA (a1)...

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