Contributors: Unité de Recherche sur les Maladies Infectieuses et Tropicales Emergentes (URMITE); Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut National de la Santé et de la Recherche Médicale (INSERM)-IFR48; Institut des sciences biologiques - CNRS Biologie (INSB-CNRS)-Institut des sciences biologiques - CNRS Biologie (INSB-CNRS)-Centre National de la Recherche Scientifique (CNRS); Maladies infectieuses et vecteurs : écologie, génétique, évolution et contrôle (MIVEGEC); Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD Occitanie ); Centre d’Infection et d’Immunité de Lille - INSERM U 1019 - UMR 9017 - UMR 8204 (CIIL); Institut Pasteur de Lille; Pasteur Network (Réseau International des Instituts Pasteur)-Pasteur Network (Réseau International des Instituts Pasteur)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Lille-Centre Hospitalier Régional Universitaire CHU Lille (CHRU Lille)-Centre National de la Recherche Scientifique (CNRS); Université Cheikh Anta Diop de Dakar Sénégal (UCAD); Vector Control Group (MIVEGEC-VCG); Evolution des Systèmes Vectoriels (ESV); Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD Occitanie )-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD Occitanie )-Maladies infectieuses et vecteurs : écologie, génétique, évolution et contrôle (MIVEGEC); Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD Occitanie )-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD Occitanie ); Laboratoire de Recherches Médicales; Centre Espoir pour la Santé; This work integrated to Pal-Fleuve programme was supported by Espoir Pour La Sante (EPLS) GNO and the Research Institute for Development (IRD - DVS Department). This work was also integrated in the EVIMalaR Network of Excellence funded by European Community (FP7-Health 2009). The FSD "Fonds Social de Developpement", (BIOMARQPAL ref 2008 - 5901) embassy of France in Senegal provided a financial participation. Jean Biram SARR was supported by a post-doctoral fellowship provided by the "Infectiopole Sud foundation" (Marseille, France).; European Project: 242095,EC:FP7:HEALTH,FP7-HEALTH-2009-single-stage,EVIMALAR(2009)
نبذة مختصرة : International audience ; ABSTRACT: BACKGROUND: During the last decades two dams were constructed along the Senegal River. These intensified the practice of agriculture along the river valley basin. We conducted a study to assess malaria vector diversity, dynamics and malaria transmission in the area. METHODS: A cross-sectional entomological study was performed in September 2008 in 20 villages of the middle Senegal River valley to evaluate the variations of Anopheles density according to local environment. A longitudinal study was performed, from October 2008 to January 2010, in 5 selected villages, to study seasonal variations of malaria transmission. RESULTS: Among malaria vectors, 72.34% of specimens collected were An. arabiensis, 5.28% An. gambiae of the S molecular form, 3.26% M form, 12.90% An. pharoensis, 4.70% An. ziemanni, 1.48% An. funestus and 0.04% An. wellcomei. Anopheles density varied according to village location. It ranged from 0 to 21.4 Anopheles/room/day and was significantly correlated with the distance to the nearest ditch water but not to the river. Seasonal variations of Anopheles density and variety were observed with higher human biting rates during the rainy season (8.28 and 7.55 Anopheles bite/man/night in October 2008 and 2009 respectively). Transmission was low and limited to the rainy season (0.05 and 0.06 infected bite/man/night in October 2008 and 2009 respectively). During the rainy season, the endophagous rate was lower, the anthropophagic rate higher and L1014F kdr frequency higher. CONCLUSIONS: Malaria vectors are present at low-moderate density in the middle Senegal River basin with An. arabiensis as the predominant species. Other potential vectors are An. gambiae M and S form and An. funestus. Nonetheless, malaria transmission was extremely low and seasonal.
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