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Tsetse flies are the cyclical vector of human and animal African trypanosomiasis. To improve vector control in order to achieve the elimination of human African trypanosomiasis (HAT) and boost the control of animal diseases, investigations have been undertaken on the tripartite association between tsetse, trypanosome, and symbionts. It is in this light that  Sodalis glossinidius  and different trypanosomes were identified in  Glossina palpalis palpalis  caught in Fontem in southern Cameroon. For this study, DNA was extracted from whole flies, and  S. glossinidius  and different trypanosome species were identified by polymerase chain reaction (PCR). Statistical analyses were performed to compare the trypanosome and  S. glossinidius  infection rates and to look for an association between these microorganisms. Of the 274  G. p. palpalis  caught, 3.3% (9/274) were teneral. About 35% (96/274) of these flies harbored  S. glossinidius.  Of the 265 non-teneral flies, 37.7% were infected by trypanosomes. The infection rates of  Trypanosoma congolense “ forest type” and  Trypanosoma vivax  were 26.04% and 18.11%, respectively. About 6.41% of tsetse harbored mixed infections of  T. congolense  and  T. vivax . Of the 69 tsetse with  T. congolense  infections, 33.33% (23/69) harbored  S. glossinidius  while 71.86% (69/96) of flies harboring  S. glossinidius  were not infected by trypanosomes. No association was observed between  S. glossinidius  and trypanosome infections. Some wild tsetse harbor  S. glossinidius  and trypanosomes, while others have no infection or are infected by only one of these microorganisms. We conclude that the presence of  S. glossinidius  does not favor trypanosome infections in  G. p. palpalis  of the Fontem focus.

parasite

Prevalence of <i>Sodalis glossinidius</i> and different trypanosome species in <i>Glossina palpalis palpali</i>s caught in the Fontem sleeping sickness focus of the southern Cameroon

Prevalence of Sodalis glossinidius and different trypanosome species in Glossina palpalis palpalis caught in the Fontem sleeping sickness focus of the southern Cameroon