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Field evaluation of Icon®Life, a long-lasting insecticidal net (LLIN) against Anopheles culicifacies and transmission of malaria in District Gautam Budh Nagar (Uttar Pradesh), India

Author(s): P.K. Mittal, Ripu Daman Sood, Neera Kapoor, R.K. Razdan & A.P. Dash

Journal: Journal of Vector Borne Diseases
ISSN 0972-9062

Volume: 49;
Issue: 3;
Start page: 181;
Date: 2012;
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Keywords: Anopheles culicifacies | Icon® Life | India | long-lasting insecticidal nets | mosquito density | wash resistance

Background & objectives: In the present study, Icon®Life net, a long-lasting polyethylene net, 100 denier andbursting strength of minimum 280 kpa incorporated with deltamethrin @ 65 mg/m2 was evaluated for its efficacyin reducing the density of malaria vector Anopheles culicifacies and impact on malaria prevalence in a malariaendemic area of District Gautam Budh Nagar, India.Methods: Wash resistance of Icon® Life LLIN was determined up to 20 serial washings using An. culicifacies incone bioassays under field conditions. Efficacy of Icon®Life LLIN was determined in the field in three sets ofvillages in District Gautam Budh Nagar (Uttar Pradesh), India, selected randomly for the intervention withIcon®Life LLIN, untreated nets and a control without any intervention for the period of August 2008–July 2009.Entomological and malariometric indices in all the three villages were compared during pre- and post-interventionperiods for one year against An. culicifacies. A survey was also conducted in the village provided with Icon® LifeLLIN to assessing the perception of community regarding acceptance of these nets by the community.Results: In cone bioassays on Icon®Life LLIN with An. culicifacies, >95% knockdown within 1 h and 100%mortality after 24 h exposure were reported even after 20× serial washings under field conditions. Results ofthe field study revealed reduced entry rate, resting density and parity rate of An. culicifacies in the village withIcon®Life LLIN when compared to no net and untreated net villages. Number of malaria cases reported wereless in the Icon®Life LLIN used villages when compared to other two villages. The community compliance andacceptance was high and no adverse health events were reported by the households using these nets.Conclusions: Icon® Life LLIN is an effective intervention for the control of An. culicifacies transmitted malariain India. Long-term studies are indicated for the duration of effectiveness and to ascertain the epidemiologicalimpact of the use of Icon® Life nets.

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