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Ointments and clothing samples can be given a general screening to determine their value as barriers in protecting man from infection by schistosome cercariae. The method depends upon the development of a rash with local inflammatory reaction at the site of cercarial penetration in mammalian skin and upon the count of these penetration sites about 24 hours after exposure of the skin test area to a counted number of cercariae. Test samples can be handled with relative ease and results obtained quickly.
This method of testing schistosome cercarial barriers appears to be an improvement over previously described technics because: