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The Impact of Human Immunodeficiency Virus Infection on the Epidemiology and Treatment of Trypanosoma Brucei Gambiense Sleeping Sickness in Nioki, Zaire

To determine if there is an association between human immunodeficiency virus type 1 (HIV-1) infection and Trypanosoma brucei gambiense sleeping sickness, all incident cases of trypanosomiasis and a control group of blood donors presenting to the same rural hospital in Zaire were tested for anti-human immunodeficiency virus type 1 (anti-HIV-1) antibodies. There was no significant difference in the prevalence of HIV-1 infection between the two groups (7 of 220, [3.2%] for the incident cases and 8 of 388 [2.1%] for the blood donors; P = 0.56). Among the three HIV-1 seropositive incident cases of trypanosomiasis treated with difluoromethylornithine, two (67%) relapsed after treatment compared with four of 39 (10%) HIV-1 seronegative incident cases treated with the same drug (P = 0.05). These findings suggest that at the present time, HIV-1 infection is not having a significant impact on the incidence of T. brucei gambiense sleeping sickness in rural Zaire, but the possibility that incident cases of trypanosomiasis concurrently infected with HIV-1 may be at higher risk of treatment failure warrants further investigation.