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Exposure time of Trypanosoma rhodesiense as short as 1 minute to ultraviolet (U.V.) light prevents the organisms from causing infection. Live trypanosome challenge of mice immunized with U.V.-irradiated trypanosomes results in sterile immunity. This allows a method for the induction of protective immunity to experimental trypanosomiasis which can be performed in most laboratoires using U.V. germicidal lamps found in sterile hoods.
Accepted for publication March 7, 1981.
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