Population dynamics of Anopheles gambiae s.l. in Bobo-Dioulasso city: Bionomics, infection rate and susceptibility to insecticides

Dabiré Roch Kounbobr, Namountougou Moussa, Sawadogo Simon P., Yaro Lassina B., Toé Hyacinthe K., Ouari Ali, Gouagna Louis-Clément, Simard Frédéric, Chandre Fabrice, Baldet Thierry, Bass Chris, Diabaté Abdoulaye. 2012. Population dynamics of Anopheles gambiae s.l. in Bobo-Dioulasso city: Bionomics, infection rate and susceptibility to insecticides. Parasites and Vectors, 5 (127), 8 p.

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Quartile : Q1, Sujet : PARASITOLOGY

Abstract : Background: Historical studies have indicated that An. gambiae s.s. is the predominant malaria vector species in Bobo-Dioulasso the second biggest city of Burkina Faso (West Africa). However, over the last decade, An. arabiensis appears to be replacing An. gambiae s.s. as the most prevalent malaria vector in this urban setting. To investigate this species transition in more detail the present study aims to provide an update on the malaria vector composition in Bobo-Dioulasso, and also the Plasmodium infection rates and susceptibility to insecticides of the local An. gambiae s.l. population. Methods: An entomological survey was carried out from May to December 2008 in Dioulassoba and Kodeni (central and peripheral districts respectively), which are representative of the main ecological features of the city. Sampling consisted of the collection of larval stages from water bodies, and adults by monthly indoor residual spraying (IRS) using aerosol insecticides. Insecticide susceptibility tests were performed using the WHO filter paper protocol on adults emerged from larvae. PCR was used to determine vector species and to identify resistance mechanisms (kdr and ace-1 R). The Plasmodium infection rate was estimated by ELISA performed on female mosquitoes collected indoors by IRS. Results: An. arabiensis was found to be the major malaria vector in Bobo-Dioulasso, comprising 50 to 100% of the vector population. The sporozoite infection rate for An. arabiensis was higher than An. gambiae s.s. at both Dioulassoba and Kodeni. An. gambiae s.l. was resistant to DDT and cross-resistant to pyrethroids at the two sites with higher levels of resistance observed in An. gambiae s.s. than An. arabiensis. Resistance to 0.1% bendiocarb was observed in the An. gambiae s.s. S form but not the M form or in An. arabiensis. The L1014F kdr mutation was detected in the two molecular forms of An. gambiae s.s. at varying frequencies (0.45 to 0.92), but was not detected in An. arabiensis, suggesting that other mechanisms are involved in DDT resistance in this species. The ace-1 R mutation was only detected in the S molecular form and was observed at the two sites at similar frequency (0.3). Conclusions: Over the last ten years, An. arabiensis has become the major malaria vector in Bobo-Dioulasso city where it was formerly present only at low frequency. However, the ecological determinant that enhances the settlement of this species into urban and peri-urban areas of Bobo-Dioulasso remains to be clarified. The impact of the changing An. gambiae s.l. population in this region for vector control including resistance management strategies is discussed. (Résumé d'auteur)

Mots-clés Agrovoc : Anopheles arabiensis, Anopheles gambiae, Malaria, Plasmodium, Dynamique des populations, Vecteur de maladie, Transmission des maladies, Résistance aux pesticides, DDT, Insecticide

Mots-clés géographiques Agrovoc : Burkina Faso

Classification Agris : L72 - Pests of animals
L73 - Animal diseases

Champ stratégique Cirad : Axe 4 (2005-2013) - Santé animale et maladies émergentes

Auteurs et affiliations

  • Dabiré Roch Kounbobr, Institut de Recherche en Sciences de la Santé (BFA)
  • Namountougou Moussa, IRSS (BFA)
  • Sawadogo Simon P., IRSS (BFA)
  • Yaro Lassina B., IRSS (BFA)
  • Toé Hyacinthe K., IRSS (BFA)
  • Ouari Ali, IRSS (BFA)
  • Gouagna Louis-Clément, IRD (FRA)
  • Simard Frédéric, IRSS (BFA)
  • Chandre Fabrice, IRD (FRA)
  • Baldet Thierry, CIRAD-BIOS-UMR CMAEE (FRA) ORCID: 0000-0003-2979-9517
  • Bass Chris, Rothamsted Experiment Station (GBR)
  • Diabaté Abdoulaye, Institut de Recherche en Sciences de la Santé (BFA)

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