Abstract

The infectivity test of Rickman and Robson was shown to be an excellent method for distinguishing betweenT. brucei andT. rhodesiense in the small number of samples tested. A modification of the test by the use of human plasma in lieu of whole blood revealed that a one-half hour incubation was long enough for the factor found present in human plasma to act as an inhibitor of infection of mice withT. brucei.

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