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A simple field test for detecting pyrethroids on impregnated nets

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We tested a modified Beilstein method for detecting pyrethroids on bednets under laboratory conditions using an emulsifiable concentrate of permethrin (50 EC) for viability as a simple standardized field test and to judge its reliability for detecting different insecticide doses. At the recommended doses of permethrin(0.5 g/m2), sensitivity was near 100%, even when small pieces of fabric were tested and time of extraction was limited. In unwashed nets sensitivity stayed high (80–95%) down to 0.1 g active ingredient/m2. In untreated nets false positives were rare (0–2%). The test could become a valuable tool in vector control programmes: it is cheap, easy to learn and to perform. The Lot Quality Assurance Sampling method, using an upper and lower performance threshold, could be applied for monitoring the impregnation campaigns.

Keywords: insecticide-treated bednets; monitoring; permethrin

Document Type: Research Article


Affiliations: 1: Institute for Tropical Medicine, Antwerp, Belgium, 2: Institute for Malariology, Parasitology and Entomology, Hanoi, Vietnam

Publication date: October 1, 1998

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