Browsing by Author "Oduola AO, Abiodun Obembe, Adelaja OJ and Ande AT"

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    Surveillance and insecticide susceptibility status of culicine mosquitoes in selected communities utilizing long-lasting insecticidal nets in kwara state, Nigeria
    (2016) Oduola AO, Abiodun Obembe, Adelaja OJ and Ande AT
    Vector control programs in Nigeria are mostly targeted towards reducing the burden of malaria with less emphasis placed on other debilitating vector borne diseases such as dengue, yellow fever and filariasis. This study assessed the indoor resting densities and insecticide susceptibility status of Culex and Aedes mosquitoes in selected communities utilizing long-lasting insecticidal nets (LLIN) in Kwara State, Nigeria. Pyrethrum spray collections of indoor resting Aedes and Culex mosquitoes were conducted in three communities while adults of both mosquito species reared from larval collections were exposed to pyrethroid, organochlorine, and carbamate insecticides following WHO procedure. Results showed that the higher indoor resting densities of Culex quinquefasciatus (2.5 – 3.4) collected were not significantly (p>0.05) different from the Aedes aegypti (0.3 – 1.3) in all the communities. Carbamate resistance (≤ 81 % post exposure mortalities) was observed in both Culex (Ilota and Amoyo) and Aedes populations (Gaa-Bolorunduro). Aedes in Gaa-Bolorunduro and Ilota were fully susceptible (100 % mortality) to permethrin and DDT while the Culex population showed differential susceptibility (64 – 100%) to pyrethroid and organochlorine insecticides tested. These findings show focal insecticide resistance requiring specific intervention in each community based on the evidence provided by this study. Pyrethroid resistance status of the Culex quinquefasciatus in these areas may result in access of the vectors to net occupants leading to lower LLIN utilization rates among users. Environmental management strategy in addition to the use of effective insecticide will be most probable for management of vector borne diseases in these localities.