The vectorial competence of the non-teneral tsetse flies of Glossina morsitans morsitans (strain Mall) infected by Trypanosoma (Nannomonas) congolense IL 1180.

Non-teneral tsetse flies of Glossina morsitans morsitans (strain Mall) abou t 16 days old were-fed, once, on a rat infected by Trypanosoma congolense I L 1180. The global vectorial competence (VC) of these flies was appraised a t 0.1035. VC in males was more important than for females. Infection by mes oprocyclic index was greater in female flies than in male ones, whereas for metacyclic index the reverse was true. This work shows that the age limits , but does not impede metacyclogenesis of non-teneral tsetse flies of G. m. morsitans (strain Mall).