Impact of Long-Lasting Insecticidal Nets and Indoor Residual Sprayings on Susceptibility of Anopheles gambiae (Diptera: Culicidae) in Western Côte d'Ivoire

Table 3

Variation of ratios of the knockdown times for 50% individuals (RR₅₀ with 95% CI) of field An. gambiae from long-lasting insecticidal nets (LLINs) of Permanet type, indoor residual sprayings (IRS), untreated nets, and controls villages over the knockdown times for 50% individuals of the Kisumu susceptible strain exposed for 1 hour to 0.05% deltamethrin, 1% permethrin, and 4% DDT impregnated papers.

Months	Status	0.05% deltamethrin	1% permethrin	4% DDT
0	LLINs	2.5	1.9	1.6
	Untreated nets	1.6	2.0	2.0
	IRS	2.4	2.3	2.3
	Controls	1.7	1.3	1.1
3	LLINs	1.9	2.4	—
	Untreated nets	1.8	—	—
	IRS	1.7	—	—
	Controls	1.4	2.1	—
6	LLINs	2.3	2.4	2.7
	Untreated nets	2.1	2.1	1.8
	IRS	2.2	2.0	2.6
	Controls	2.2	2.0	—
12	LLINs	1.6	2.0	1.6
	Untreated nets	1.7	1.5	2.2
	IRS	1.5	1.8	1.8
	Controls	1.4	1.8	0.6
15	LLINs	1.1	1.4	1.6
	Untreated nets	1.6	1.2	1.3
	IRS	1.4	—	—
	Controls	1.3	1.3	1.5