抄録
It was demonstrated that chickens fed with thiamine-decomposing bacteria may produce specific precipitin in sera to thiaminase I and II respectively. It was not always successful at all times to isolate the thiamine-decomposing bacteria from the feces of the human beings who have these bacteria in their intestines. These bacteria may appear at intervals of several days in feces. Therefore, a single attempt of isolation could not decide the positive rate of the carriers.
