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Volume 13, Number 2—February 2007

Research

Reduced Efficacy of Insecticide-treated Nets and Indoor Residual Spraying for Malaria Control in Pyrethroid Resistance Area, Benin

Raphael N’Guessan*, Vincent Corbel†, Martin Akogbéto‡§, and Mark RowlandComments to Author 
Author affiliations: *London School of Hygiene and Tropical Medicine, Cotonou, Benin, West Africa; †Institut de Recherche pour le Developpement, Montpellier, France; ‡University of Abomey-Calavi, Cotonou, Benin; §Centre de Recherche Entomologique, Cotonou, Benin¶London School of Hygiene and Tropical Medicine, London, United Kingdom;

Main Article

Table 2

Experimental hut results of lambdacyhalothrin (insecticide)-treated nets (ITNs) and indoor residual spraying (IRS) against Anopheles gambiae, Ladji (pyrethroid resistance) and Malanville (pyrethroid susceptibility) field stations*



Ladji (pyrethroid resistance)
Malanville (pyrethroid susceptibility)
ITNUntreated netLambdacyhalothrin 18 mg/m2Untreated netLambdacyhalothrin 18 mg/m2
Total collected689a386b363a267b
Deterred, %_44.0._26.4
Exiting, % (CI)25.0†
(21.7–28.2)29.0†
(24.5–33.5)36.1
(31.1–41.0)46.8‡
(40.8–52.8)
Blood-fed, % (CI)82.0†
(79.1–84.9)82.1†
(78.3–85.9)77.7†
(73.4–81.9)3.0‡
(0.9–5.0)
Blood-feeding inhibition, %_0_96.1
Personal protection, % (no. bloodfed)– (572)44.6 (317)– (282)97.2 (8)
% Dead (CI)13.6† (11.1–16.2)29.8‡ 25.2–34.4)3.6† (1.7–5.5)98.5‡ (97.0–99.9)

Insecticidal effect, % (no. dead)
– (94)
3.0 (115)
– (13)
68.9 (263)
IRS

Unsprayed hut
Lambdacyhalothrin 30 mg/m2
Unsprayed hut
Lambdacyhalothrin 30 mg/m2
Total collected203†117‡498†395‡
Deterred, %_42.4_20.7
Exiting, % (CI)45.8† (38.9–52.7)58.1† (49.2–67.1)54.4† (50.0–58.8)63.3† (58.5–68.0)
Blood-fed, % (CI)87.7† (83.2–92.2)73.5‡ (65.5–81.5)93.8† (91.6–95.9)69.6‡ (65.1–74.2)
Blood-feeding inhibition, %_16.2_25.8
Personal protection, % (no. bloodfed)– (178)51.7 (86)– (467)41.1 (275)
Dead, % (CI)12.3† (7.8–16.8)30.8† (22.4–39.1)1.4† (0.4–2.4)72.1‡ (67.7–76.6)
Insecticidal effect, % (no. dead)– (25)5.4 (36)– (7)55.8 (285)

*For each untreated–treated pair, values not sharing the same superscript are significantly different at the 5% level.. CI, 95% confidence interval.

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