Short Persistence and Vector Susceptibility to Ficam 80WP (bendiocarb active ingredient) During Pilot Application of Indoor Residual Spraying in Burkina Faso, West Africa

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Journal of Medical Entomology
Indoor residual spraying (IRS) was applied in addition to the use of long-lasting insecticidal nets in the SouthWest in Burkina Faso, where Anopheles gambiae s.l. the major malaria vector was resistant to pyrethroids. This study was designed to evaluate the efficacy and residual life of bendiocarb (active ingredient) used forspraying on different wall surfaces (mud and cement). Cone bioassays were done monthly with the susceptible An. gambiae ‘Kisumu’ strain and the local wild populations to determine the duration for which insecticide was effective in killing mosquitoes. Cone bioassay data showed low efficacy and short persistence ofbendiocarb applied on mud and cement walls, lasting 2 mo with the susceptible insectary strain and less than1 mo with An. gambiae wild populations. In addition, WHO tube assays confirmed resistance of An. gambiaewild populations to 0.1% bendiocarb with mortality rates less than 80% in both study sites (sprayed and unsprayed sites). The pilot study of IRS with bendiocarb showed that the residual efficacy of bendiocarb was veryshort, and resistance to bendiocarb was confirmed in wild populations of An. gambiae s.l. Therefore, Ficam 80WP was not suitable for IRS in this area due to the short residual duration related mainly to vectors resistanceto bendiocarb. While waiting for innovative malaria control tool, alternative insecticide (organophosphate orneonicotinoid classes) or combinations of insecticides have to be used for insecticide resistance managementin Burkina Faso.
indoor residual spraying, bendiocarb, residual efficacy, Diebougou, Dano, Burkina Faso, Moussa Namountougou, Serge Bèwadéyir Poda, Université Nazi Boni, ACE: Bio-technological Innovation for the Elimination of Vector- Borne Diseases, CEA-ITECH_MTV