| Popis: |
Background: Following vectors resistance to both pyrethroid and carbamates, organophosphate (pirimiphos-methyl) was used in the Indoor Residual Spray campaigns of 2015 to 2016 in the district of Koulikoro. In this context, we assessed the effect of IRS on malaria transmission by comparing entomological indices in two localities: Koulikoro (LLINs+IRS), and Banamba (LLINs -only) districts. Methods: The study was conducted in two villages of each of Koulikoro and Banamba in 2016. Pyrethroid spray catch and entry window trapping where used to collect mosquitoes monthly WHO bioassay test was used to assess mosquito’s susceptibility to insecticides. Mosquitoes were identified into species by PCR and the infection rate using ELISA. Results: An. coluzii was by far the most frequent species. Its density was rainfall dependent in no-IRS area, and almost independent in IRS area. The IR in the no-IRS area was 1.24%, while in the IRS area, we could not detect infection. In the no-IRS area, the EIR was 0.21 infective bites /person month with the peak in September. High resistance to pyrethroids and carbamates and susceptibility to organophosphates was observed in all sites. Conclusion: A big randomized study is needed to better estimate the added value of the IRS in an integrated malaria control strategy. Key words: Mali, IRS, Long-lasting insecticidal nets, insecticide resistance, transmission. |
