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Une etude preliminaire entomo-parasitologique a ete effectuee pendant la grande saison seche a l’interieur et autour du bai de Momba (nord-est Gabon) pour examiner les especes de Trypanosomes transmises par les glossines. Ces dernieres ont ete capturees a l’aide des pieges vavoua et nzi. Les infections par les trypanosomes chez ces glossines ont ete recherchees a l’aide d’un microscope au niveau des glandes salivaires, proboscis et intestins moyens des glossines. Ainsi, une infection du proboscis seul correspond a T. vivax , celles des glandes salivaires a T. brucei et celle du proboscis et de l’intestin moyen a T. congolense. Au total six especes de glossines ont ete identifiees : Glossina palpalis palpalis , G. nashi , G. fusca congolensis , G. tachinoides , G. frezili et G. fuscipes fuscipes . Le taux global d’infestation des glossines dissequees et observees au microscope a ete estime a 30 %. L’infestation des glossines par les trypanosomes temoigne de l’existence d’un risque trypanosomien dans le bai de Momba et suggere ainsi l’etablissement d’un cycle de transmission Animal-Glossine-Homme dans ce milieu. Mots cles: Glossina, T. vivax , T. congolense , bai de Momba, trypanosomes. Preliminary study of infection of tsetse by trypanosomes in the bai of Momba North East Gabon A preliminary study are insect parasitology was carried out during the long dry season in and around the bai of Momba (north-east Gabon) to examine the species of trypanosomes transmitted by tsetse flies. The flies were captured using traps and Vavoua nzi. Infections by trypanosomes were investigated using a microscope in the salivary glands and the proboscis intestines means tsetse. In total six tsetse species were identified : Glossina palpalis palpalis , G. nashi , G. fusca congolensis , G. tachinoides , G. frezili and G. fuscipes fuscipes . The overall rate of infestation of flies dissected and observed under the microscope is estimated at 30 %. The infestation of Bai Momba by flies carrying trypanosomes demonstrates the existence of a trypanosome risk and thus suggests the establishment of a transmission cycle Human-Animal- Glossina in this environment. Keywords: tsetse flies, T. vivax , T. congolense , bai of Momba, trypanosome

Effet de l’érosion hydrique sur les caractéristiques physicochimiques du sol des zones d’érosion (dongas) dans la Commune de Karimama au Bénin