A comparison of surface and total deltamethrin levels of insecticide-treated nets and estimation of the effective insecticidal lifetime

Journal article

The ability to anticipate the useful lifetime of an insecticide-treated mosquito net (ITN) would provide a proactive approach for planning net distribution programs. Therefore, we used an exponential decay model of deltamethrin depletion to predict the effective insecticidal lifetime of PermaNet^® 2.0 nets used in the Lao PDR. Residual deltamethrin was measured using two nondestructive analytical field methods; X-ray fluorescence (total levels) and a colorimetric field test (surface levels) at 12 and 24 months postdistribution. The model assumes that the 12-month depletion rate can be used to predict future levels. The median total and surface deltamethrin levels for the Lao nets at 12 months were 31.2 and 0.0743 mg/m², respectively. By defining a failed net as having total deltamethrin levels of less than 15 mg/m² or a surface level less than 0.0028 mg/m², it was predicted that 50% of the group of nets will fail at about 27 months after distribution.

Authors: Green, M; Maxyay, M; Pongvongsa, T; Phompida, S; Swamidoss, I

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: American Society of Tropical Medicine and Hygiene
• Journal: American Journal of Tropical Medicine and Hygiene
• Volume: 106
• Issue: 1
• Pages: 334-337
• Publication date: 2021-11-15
• Acceptance date: 2021-07-21
• DOI: 10.4269/ajtmh.21-0144
• EISSN: 1476-1645
• ISSN: 0002-9637
• Pmid: 34781252
• Language: English
• Keywords: FFR