Field Residual Efficacy of PermaNet®2.0 against gambiae s.l in different rural communities of Ethiopia
Keywords:
residual efficacy, long lasting mosquito nets, An. gambiae s.l, EthiopiaAbstract
Background: Long lasting insecticide treated mosquito nets (LLINs) could retain their effective biological activity for at least twenty WHO standard washes under laboratory conditions and three years effective life under field conditions. However, the dynamics of insecticide loss could vary with users’ practices in handling and wearing of LLINs. Therefore, bio-efficacy test is recommended to detect net status before it gets lost its lethal dose.
Method: Long lasting treated mosquito nets were sampled randomly from three different localities found in different districts and the performances of these nets were evaluated using WHO cone test procedures. Efficacy was measured in terms of mortality and knockdown effects on susceptible Anopheles gambiae s.l.
Results: Except two nets all LLINs showed high level of mortality and knockdown rates implying that the nets could retain their biological activity under field conditions as recommended.
Conclusion: The present study showed both success and failures showing that LLINs could retain the lethal effect for three years as recommended if used properly while failures suggest the need to conduct a follow-up efficacy tests in order to identify the limitations that could contribute for net failure or shrink the effective life of the nets.
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