Several important papers concerning the results of intradermal tests with the peptide antigen of helminths prepared by Yamamura's method which was designed for the extraction of tuberculin active peptide have been published. For examples, Ishii and Morisawa (1961) applied it to paragonimiasis, Yoshimura (1963) to filariasis, and Tada (1966) to gnathostomiasis. Akusawa and Tsuchiya (1965) also discussed on the relation between the peptide antigen and the Melcher antigen.We applied the antigen obtained from Clonorchis sinensis by the method mentioned above to the intradermal test and found some relationships between the result of the test and that of stool examination studied in school children of Mitsumata Junior High School and several inhabitants of the neighbouring area, Okawa City, Fukuoka Prefecture. The survey was done in October, 1966. The presenting paper is to describe the results obtained.
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