| Popis: |
Vector control programs in Nigeria are mostly targeted towards reducing the burden ofmalaria with less emphasis placed on other debilitating vector borne diseases such asdengue, yellow fever and filariasis. This study assessed the indoor resting densities andinsecticide susceptibility status of Culex and Aedes mosquitoes in selected communitiesutilizing long-lasting insecticidal nets (LLIN) in Kwara State, Nigeria. Pyrethrum spraycollections of indoor resting Aedes and Culex mosquitoes were conducted in threecommunities while adults of both mosquito species reared from larval collections wereexposed to pyrethroid, organochlorine, and carbamate insecticides following WHOprocedure. Results showed that the higher indoor resting densities of Culexquinquefasciatus (2.5 – 3.4) collected were not significantly (p>0.05) different from theAedes aegypti (0.3 – 1.3) in all the communities. Carbamate resistance (≤ 81 % postexposure mortalities) was observed in both Culex (Ilota and Amoyo) and Aedespopulations (Gaa-Bolorunduro). Aedes in Gaa-Bolorunduro and Ilota were fullysusceptible (100 % mortality) to permethrin and DDT while the Culex population showeddifferential susceptibility (64 – 100%) to pyrethroid and organochlorine insecticidestested. These findings show focal insecticide resistance requiring specific intervention ineach community based on the evidence provided by this study. Pyrethroid resistancestatus of the Culex quinquefasciatus in these areas may result in access of the vectors tonet occupants leading to lower LLIN utilization rates among users. Environmentalmanagement strategy in addition to the use of effective insecticide will be most probablefor management of vector borne diseases in these localities.Keywords: Insecticide resistance, Aedes aegypti, Culex quinquefasciatus, LLIN, Dengue, LymphaticFilariasis, Kwara State, Nigeria |
