Skip directly to search Skip directly to A to Z list Skip directly to site content
CDC Home

Volume 13, Number 2—February 2007


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 4

Experimental hut results of lambdacyalothrin (insecticide)-treated nets (ITNs) and indoor residual spraying (IRS) against Culex quinquefasciatus, Ladji (pyrethroid resistance) field station*

Untreated netLambdacyhalothrin 18 mg/m2Unsprayed hutLambdacyhalothrin 30 mg/m2
Total entered845598858769
Deterred, %_29.2_10.4
Exiting, % (CI)29.8 (26.7–32.9)35.9 (32.1–39.8)52.7 (49.3–56.0)54.6 (51.1–58.1)
Blood-fed, % (CI)62.8 (59.6–56.1)59.5 (55.6–63.5)85.1 (82.7–87.5)42.9 (39.4–46.4)
Blood-feeding inhibitionNS49.6
Personal protection, % (no. blood-fed– (531)33.1 (355)– (730)54.8 (330)
Dead, % (CI)4.3 (2.9–5.6)8.5 (6.3–10.8)3.4 (2.2–4.6)16.3 (13.7–18.9)
Insecticidal effect, % (no. dead)– (36)1.9 (51)– (29)11.6 (125)

*CI, 95% confidence interval.

Main Article

Top of Page The U.S. Government's Official Web PortalDepartment of Health and Human Services
Centers for Disease Control and Prevention   1600 Clifton Rd. Atlanta, GA 30333, USA
800-CDC-INFO (800-232-4636) TTY: (888) 232-6348 - Contact CDC–INFO