Abstract
The relation between typhoid germ and shellfishes, especially oysters, has been intensively studied by many authors, and definite rules and regulations have been put in force for keeping the oysters free from the contamination by human excrement. But the bloody-clam has not yet been dealt with from the view-points of sanitary science. The material was obtained from several districts of northern as well as southern Japan (Aomori, Miyagi, Tiba, Tokyo, Aiti, Kumamoto Prefectures, Hokkaido and Korea.) during a period from January to February, 1936. Bacteriological analysis done according to Dr. TOHYA-MA'S improved method show that the B. coil score of shell oysters under 50 amounts to 96% of the total, including 60% of the score 0 and also 88% of the score under 5. The remaining 4% of the total belong to the score over 50 by American standard. (see Table 1)
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