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Resistencia al lavado y eficacia de tres redes mosquiteras de larga duración evaluadas mediante bioensayos con Anopheles culicifacies y Anopheles stephensi
Author(s) -
Sreehari U.,
Raghavendra K.,
Rizvi M. M. A.,
Dash A. P.
Publication year - 2009
Publication title -
tropical medicine and international health
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.056
H-Index - 114
eISSN - 1365-3156
pISSN - 1360-2276
DOI - 10.1111/j.1365-3156.2009.02252.x
Subject(s) - anopheles stephensi , anopheles culicifacies , bioassay , biology , toxicology , anopheles , malaria , aedes aegypti , immunology , botany , larva , ecology
Summary Objective To test the wash resistance and efficacy of long‐lasting insecticidal nets (LLINs), namely Olyset ® Net and PermaNet ® 2.0; and a long‐lasting treatment kit, K‐O Tab ® 1‐2‐3, on Anopheles culicifacies and An. stephensi , major malaria vectors in India, by bioassays. Conventionally treated deltamethrin net (CTDN with K‐O Tab) was used for comparison. Method Mortality and median time for knockdown (MTKD) of mosquitoes were determined using contact bioassays and ball frame bioassays respectively. Hand washing and machine washing were used. Results LLINs showed good bio‐efficacy against An. culicifacies and An. stephensi . The mortality of mosquitoes remained >80% after up to 20 hand washes and up to 15 machine washes on all LLINs tested. No significant differences were observed in mortalities between the An. culicifacies and An. stephensi in cone bioassays ( P > 0.05). MTKD increased progressively with successive washes and there was a significant difference in median time for knockdown of test mosquitoes and between hand‐washed and machine‐washed nets ( P < 0.05). Conclusion LLINs are more efficacious and last longer when washed by hand than by machine.