Assessing longivity of long lasting insecticidal nets in some selected sentinal sites of Ethiopia

Abstract

Introduction: Long-lasting insecticidal nets are convential tools in the prevention and control of malaria. Survey information on monitoring longevity of long-lasting insecticidal nets under field conditions is important for insecticide resistance monitoring and management in the country.
Objective: The current study aimed at evaluating the effective life time of long lasting insecticidal treated nets under operational conditions.
Materials and Methods: A cross-sectional study was conducted from January 2016 to December 2017 in Oromia, Amhara, Tigray and Southern Ethiopia regions on a total of 1416 randomly selected households owing Magnet, PermaNet 2.0 and Interceptor nets. Two years old long-lasting insecticide nets were examined for their physical status, bio-efficacy and chemical analysis.
Results: Community net utilization was 75.7% and the proportional hole index of Magnet, PermaNet 2.0 and Interceptor nets were 24.2, 21.7 and 21.6, respectively. The mean mosquito knocks down and mortality rates for Magnet net were 93.5% and 95.1% respectively. Mean knock down and mortality rates for PermaNet 2.0 were 85% with 87% while mean mosquito knock down and mortality rates for Interceptor were found to be 96% with 92.3%, respectively. The mean knockdown for all different type of net was 91.8% and the mortality rate was 91.75%. The mean concentrations of deltamethrinin on Magnet and PermaNet 2.0 were 362.41 mg/m2 and 377.2mg/m2 respectively. Concentration of Alphacypermehtrine in the Interceptor was 2627 mg/m2.
Conclusion: The current study revealed that, community net utilization was low while, the physical integrity and insecticidal activities of all net types were found to have acceptable protection after two years of use. Additional study should be required after two years on durability of long-lasting insecticidal nets.