Abstract

Tests were made in mice on the resistance of cattle trypanosomes to human plasma. 12 stocks of Trypanosoma congolense were tested; three were fully resistant, eight were moderately or highly resistant, and one was fully sensitive. Four stocks of T. vivax were tested; two were fully resistant, one was somewhat resistant and one was highly sensitive. Two stocks of T. evansi were tested; both fully sensitive. The possibility is discussed that T. congolense and T. vivax might produce transient infections in man.

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