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The alkylating agent N-methyl-N'-nitro-N-nitrosoguanidine (NTG) was tested as an attenuating agent for Trypanosoma brucei. Parasites were treated with 4 mcg/ml NTG and injected into mice at intervals of 714 days. Those mice surviving four injections of NTG-treated trypanosomes were later challenged and showed a 100% resistance to infection. A corresponding group of control mice showed a 6% resistance to infection.
Accepted for publication December 20, 1980.
* This study was supported in part by NIH MBS research grant RR08156-01.
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