Abstract
Pyrethroid insecticides resistance in several Anopheles species represents a threat for the success of malaria vector control based on using treated nets and indoor sprayings. Impact of the long-lasting insecticidal net (LLIN) of Permanet type and indoor residual spraying (IRS) with deltamethrin on the levels of susceptibility to pyrethroids and DDT were investigated in field populations of Anopheles gambiae in 12 villages located in the Danané area in Western Côte d'Ivoire. From May 2001 to July 2002, adult An. gambiae reared from larvae collected from these villages were tested with 0.05% deltamethrin, 1% permethrin, and 4% DDT impregnated papers using WHO standard test kits. Knockdown times for 50% of adult mosquitoes (kdT50) of field specimens from LLINs, untreated nets, IRS, and control villages significantly differed from those of the Kisumu susceptible strain. However, the resistance ratios of the kdT50 were very low. KdT50 did not significantly differ with all treatments, chemicals (LLINs and IRS), physical (untreated nets), and control. The mortalities were above 80% indicating susceptible populations of An. gambiae in the Danané area. There was no significant difference between mortality rates from the different treatments.
Highlights
Malaria vector control aims to prevent the transmission of Plasmodium parasites by using essentially treated nets and/or indoor residual sprayings with insecticides (IRS)
KdT50 did not signi cantly differ with all treatments, chemicals (LLINs and IRS), physical, and control. e mortalities were above 80% indicating susceptible populations of An. gambiae in the Danané area. ere was no signi cant difference between mortality rates from the different treatments
Many malaria vector control projects based upon sprayings were stopped because resistance to insecticides occurred in malaria mosquito populations [1] such as the Anopheles gambiae complex Giles 1902 (Diptera: Culicidae), a major malaria vector in Africa
Summary
Malaria vector control aims to prevent the transmission of Plasmodium parasites by using essentially treated nets and/or indoor residual sprayings with insecticides (IRS). Is mutation confers cross-resistance to a wide range of pyrethroids and DDT [11] It was initially detected in the S molecular form of An. gambiae s.s. from tropical Savanna areas [1, 12, 15]. More recent studies have reported six genes whose expression levels are associated with pyrethroid metabolic resistance of A. gambiae from West Africa [22]. E current survey was carried out from May 2001 to July 2002 in villages located in Western Côte d’Ivoire to investigate the impact of both LLINs of Permanet type and IRS with deltamethrin on the levels of susceptibility to pyrethroids and DDT of eld An. gambiae populations
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