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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

Published online by Cambridge University Press:  14 December 2004

M. KIRINOKI ,
M. HU ,
H. YOKOI ,
S. KAWAI ,
R. TERRADO ,
E. ILAGAN ,
Y. CHIGUSA ,
Y. SASAKI  and
H. MATSUDA
M. KIRINOKI
Affiliation:
Department of Tropical Medicine and Parasitology, Dokkyo University School of Medicine, Mibu, Shimotsuga, Tochigi 321-0293, Japan
M. HU
Affiliation:
Department of Tropical Medicine and Parasitology, Dokkyo University School of Medicine, Mibu, Shimotsuga, Tochigi 321-0293, Japan Hubei Institute of Schistosomiasis Control, Wuhan, Hubei 430070, China
H. YOKOI
Affiliation:
Department of Tropical Medicine and Parasitology, Dokkyo University School of Medicine, Mibu, Shimotsuga, Tochigi 321-0293, Japan
S. KAWAI
Affiliation:
Department of Tropical Medicine and Parasitology, Dokkyo University School of Medicine, Mibu, Shimotsuga, Tochigi 321-0293, Japan
R. TERRADO
Affiliation:
Schistosomiasis Control Team, Victoria, Oriental Mindoro, the Philippines
E. ILAGAN
Affiliation:
Schistosomiasis Control Team, Victoria, Oriental Mindoro, the Philippines
Y. CHIGUSA
Affiliation:
Department of Tropical Medicine and Parasitology, Dokkyo University School of Medicine, Mibu, Shimotsuga, Tochigi 321-0293, Japan
Y. SASAKI
Affiliation:
Department of Tropical Medicine and Parasitology, Dokkyo University School of Medicine, Mibu, Shimotsuga, Tochigi 321-0293, Japan Department of Biology, Tokyo Medical University, Shinjuku, Tokyo 160-8402, Japan
H. MATSUDA
Affiliation:
Department of Tropical Medicine and Parasitology, Dokkyo University School of Medicine, Mibu, Shimotsuga, Tochigi 321-0293, Japan
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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.

Keywords

susceptibilityOncomelania nosophoraSchistosoma japonicuminfectivityre-emerginggeographical strains
Type
Research Article
Information
Parasitology , Volume 130 , Issue 5 , May 2005 , pp. 531 - 537
Copyright
© 2005 Cambridge University Press

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