For how long does the insecticidal effect of long-lasting nets achieve high Anopheles mortality? Four PermaNets tested previously in Colombia for wash resistance were bioassayed again after 3 years of use and 23 washes. The tests were done both in Colombia and a reference laboratory in Indonesia. Additionally the residual concentration of deltamethrin on the nets was chemically analysed. The results showed high Anopheles mortality and a mean deltamethrin concentration of 9.6 mg/m2. Discrepancies with other studies are discussed.
Kroeger, A.; Skovmand, O.; Phan, Q.C.; Boewono, D.T. Combined field and laboratory evaluation of a long-term impregnated bednet, PermaNet®. Transactions of the Royal Society of Tropical Medicine and Hygiene (2004) 98 (3) 152-155. [DOI: 10.1016/S0035-9203(03)00038-5]