[Incidence of trypanosoma in the population of tsetse flies at the game ranch of Nazinga (Burkina Faso)].

The frequency of trypanosome infection in Glossina morsitans submorsitans and G. tachinoides, at the game ranch of Nazinga (Burkina Faso), was examined. Considering the absence of human activities and domestic animals, the study area can be considered as "primitive" and the infection rates as "natural". These results will contribute to clarifying some points concerning the epidemiology of the transmission of the parasite, in particular in those areas where the setting up of a natural game reserve is planned.