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STUDIES ON HOST-PARASITE RELATIONSHIPS OF SCHISTOSOMA JAPONICUM IN TAIWAN.
Chiu,Jui-Kuang
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Abstract
No new focus for oncomelanid snail was discovered. O. h. chiui was shown to be more susceptible to two Formosan strains (Ilan and Changhua) and the human Philippine strain of S. japonicum than to two human strains from Japan and mainland China. Three to 5 miracidia per snail were found to be optimum number for snail infection for all strains of S. japonicum. Susceptibility study of O. h. formosana to infection with Paragonimus iloktsuenensis supports the fact that there are three strains of O. h. formosana in Taiwan, i. e., Ilan, Changhua and Kaohsiung. Eleven species of animals including the mouse, rat, hamster, guinea-pig, rabbit, dog, cat, goat, calf, bandicoot and Formosan monkey were studied to determine the susceptibility to infection with Ilan S. japonicum. The dog was found to be the best host for Ilan strain of S. japonicum on the whole. Results obtained so far indicate that Japanese S. japonicum possesses the highest degree of infectivity among the three geographic strains of S. japonicum tested, followed by the Changhua and Ilan strains of the parasite. (Author)