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 Rowland
Table 4
Experimental hut results of lambdacyalothrin (insecticide)-treated nets (ITNs) and indoor residual spraying (IRS) against Culex quinquefasciatus, Ladji (pyrethroid resistance) field station*
| Results | Treatments | ||||
|---|---|---|---|---|---|
| ITNs | IRS | ||||
| Untreated net | Lambdacyhalothrin 18 mg/m2 | Unsprayed hut | Lambdacyhalothrin 30 mg/m2 | ||
| Total entered | 845 | 598 | 858 | 769 | |
| 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 inhibition | – | NS | – | 49.6 | |
| 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.
