Studies on schistosomiasis V. Testing protective ointments against schistosomiasis by using schistosome dermatitis producing cercariae

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Abstract
Six protective ointments selected for use against schistosomiasis were given field tests on 130 persons, using as the test organism the cercariae of the bird schistosome which causes “ koganbyo ” or lakeside disease. Those tested lived in an endemic area, and due to repeated exposures, year after year, had acquired a marked sensitivity, making them good subjects for such a test. With an 8-hour test period of work in rice paddies, copper oleate gave 95.5 per cent. protection, with dibutyl and dimethyl phthalate giving around 70 per cent., followed by N-II, N-I and benzyl benzoate in that order.

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