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The virulence of the four geographic strains of S. japonicum was found to be different in mice infected with 100 cercariae. Judging from the host's survival times after inoculation and after the appearance of eggs in the feces, the Japanese and Philippine strains of this schistosome species were shown to be more virulent than the Chinese and Formosan strains.
* This investigation was supported by Research Grant E-939, National Institute of Allergy and Infectious Diseases of the National Institutes of Health, United States Public Health Service, and by a research grant from Abbott Laboratories, North Chicago, Illinois.
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