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Residual insecticidal activity of long‐lasting deltamethrin‐treated curtains after 1 year of household use for dengue control
Author(s) -
Vanlerberghe V.,
Trongtokit Y.,
Cremonini L.,
Jirarojwatana S.,
Apiwathnasorn C.,
Van der Stuyft P.
Publication year - 2010
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.1365-3156.2010.02582.x
Subject(s) - deltamethrin , aedes aegypti , toxicology , medicine , netting , dengue fever , mosquito control , aedes , biology , pesticide , larva , malaria , botany , ecology , immunology , political science , law
Summary Objective To evaluate the residual insecticidal activity of the PermaNet ® curtains on Aedes aegypti after 1 year of use in Thai households and to assess the influence of sun and dust exposure, washing practices and detergent use. Methods We sampled UV‐protected PermaNet ® curtains made of a long‐lasting deltamethrin‐[55 mg/m 2 ] treated polyester netting, before (10 curtains) and after 8 (10 curtains) and 12 months (66 curtains) of household use in a field site in Chon Buri, Thailand. We assessed the residual insecticidal activity of the curtains by standard WHO bioassay, using a deltamethrin‐susceptible insectarium Aedes aegypti strain. Results Mosquito mortality was 100% before distribution, 100% at 8 months and 98.2% (95% CI 97.9–98.5) at 12 months of use. Sunlight, hand‐washing and detergent use had no effect on the residual insecticidal activity after 12 months. However, the mosquito survival rate increased by a factor of 6.4 (95% CI 3.5–11.8) on machine‐washed curtains and by a factor of 2.0 (95% CI 1.4–2.9) on curtains not covered by dust. Conclusion The residual insecticidal activity of PermaNet® curtains remains high after 12 months use under field conditions.