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Volume 18, Number 7—July 2012

Research

Loss of Household Protection from Use of Insecticide-Treated Nets against Pyrethroid-Resistant Mosquitoes, Benin

Alex Asidi, Raphael N’Guessan, Martin Akogbeto, Chris Curtis1, and Mark RowlandComments to Author 
Author affiliations: London School of Hygiene & Tropical Medicine, London, UK (A. Asidi, R. N’Guessan, C. Curtis, M. Rowland); and; Centre de Recherche Entomologique de Cotonou, Cotonou, Benin (A. Asidi, R. N’Guessan, M. Akogbeto)

Main Article

Table 2

Protection against Anopheles gambiae s.l. mosquitoes for persons sleeping under in-use mosquito nets before and after treatment with 18 mg/m2 lambdacyalothrin in houses in northern vs. southern sites, Benin, 2008*

Area, net condition Treatment of nets Blood fed, no. (%) OR (95% CI) p value aOR (95% CI) p value
Northern (pyrethroid-susceptible mosquitoes)
Before 810 (46) 1 1
After 1,041 (16) 0.22 (0.18–0.28) <0.001 0.34 (0.26–0.44) <0.001
No. holes
<10 Before 503 (45) 1 1
After 850 (14) 0.20 (0.16–0.27) <0.001 0.26 (0.20–0.34) <0.001
>10 Before 307 (48) 1 1
After 191 (24) 0.34 (0.23–0.51) <0.001 0.37 (0.27–0.64) <0.001
Size of holes, cm2
<15 Before 59 (36) 1 1
After 217 (17) 0.38 (0.20–0.73) 0.003 0.38 (0.20–0.73) 0.003
>15 Before 751 (47) 1 1
After 824 (16) 0.21 (0.17–0.27) <0.001 0.21 (0.17–0.27) <0.001
Southern (pyrethroid-resistant mosquitoes)
Before 268 (20) 1 1
After 424 (23) 1.19 (0.81–1.73) 0.37 1.14 (0.73–1.76) 0.57
No. holes
<10 Before 111 (18) 1 1
After 200 (21) 1.15 (0.55–1.67) 0.28 1.17 (0.62–1.81) 0.31
>10 Before 165 (27) 1 1
After 224 (25) 0.89 (0.56–1.42) 0.64 0.89 (0.56–1.41) 0.63
Size of holes, cm2
<15 Before 115 (19) 1 1
After 189 (23) 1.31 (0.74–2.36) 0.35 2.59 (1.26–5.37) 0.01
>15 Before 153 (21) 1 1
After 235 (23) 1.10 (0.67–1.8) 0.70 1.09 (0.18–1.80) 0.713

*OR, odds ratio; aOR, OR adjusted for condition of nets and household size.

Main Article

1Deceased.

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