AJTMH Transactions of the Royal Society of Tropical Medicine and Hygiene
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Am. J. Trop. Med. Hyg., 2(5), 1953, pp. 915-925
Copyright © 1953 by The American Society of Tropical Medicine and Hygiene

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The Distribution of the Snail Oncomelania nosophora, Intermediate Host of Schistosoma japonicum, Along the Tone River, Japan1

L. S. Ritchie, G. W. Hunter, III2, K. Nagano3, C. Pan, J. McConnaughey, C. Knox, M. Shimizu, S. Asakura AND Y. Hishinuma
406th Medical General Laboratory, Tokyo, Japan

An extensive survey of Oncomelania nosophora, the intermediate snail host of Schistosoma japonicum was made in the Tone River valley from Sakai to Sukayama, a distance of about 75 miles.

Snail collections were made at 40 different places, being about equally divided between the two sides of the river. Ten collections consisted of 100 or more specimens and infections of S. japonicum occurred in five. Various epidemiologic factors in the distribution of the snails are discussed.


1 APO 500, % Postmaster, San Francisco, California, and the Kitasato Institute, Tokyo, Japan.


2 Colonel, MSC, currently Chief, Parasitology-Entomology Section, Brooke Army Medical Center, Fort Sam Houston, Texas.


3 The Kitasato Institute.






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Copyright © 1953 by the American Society of Tropical Medicine and Hygiene.