Status of pyrethroid resistance in Anopheles gambiae s. s. M form prior to the scaling up of Long Lasting Insecticidal Nets (LLINs) in Adzopé, Eastern Côte d’Ivoire

Table 1 Knockdown times (KDTs) and mortality rates of Anopheles gambiae M form after exposure to diagnostic concentrations of pyrethroids on filter papers

Insecticide	Mosquito population	N	Knockdown effect						Mortality (%)	Status
			Knockdown time				KDT₅₀ Ratio
			KDT₅₀ (min)	CL 95%	KDT₉₅ (min)	CL 95%	RR₅₀	CL 95%
Permethrin 1%	Kisumu	96	9.7	9.1–10.2	13.7	12.7–15.4	-		100	S
	Port-Bouët	95	63.4	54.5–81.0	192.8	131.7–391.9	6.5	5.6–7.6	68.4^b	R
	Tsassodji	100	76.2	64.7–96.6	329.8	219.6–618.7	7.9	6.4–9.6	42.0^a	R
Deltamethrin 0.05%	Kisumu	96	21.2	18.1–24.5	38.0	31.5–53.4	-		100	S
	Port-Bouët	92	33.8	28.8–39.3	73.8	58.8–111.7	1.6	1.5–1.7	96.7^b	SR
	Tsassodji	102	50.4	46.7–55.2	133.7	110.5–174.0	2.4	2.2–2.6	58.8^a	R
Lambda-cyhalothrin 0.05%	Kisumu	95	27.5	24.5–30.3	43.4	38.4–52.9	-		100	S
Lambda-cyhalothrin 0.05%	Port-Bouët	89	44.7	41.3–48.7	82.6	70.8–106.7	1.6	1.5–1.8	84.3^b	SR
	Tsassodji	102	55.9	52.1–61.4	125.6	104.4–164.8	2.0	1.8–2.2	67.7^a	R

N: Total number of mosquitoes exposed to each insecticides; KDT₅₀ and KDT₉₅: Knockdown time (minutes) for 50% and 95% of mosquitoes; CL 95%: 95% confidence limits; RR₅₀: Resistance ratio at Kd₅₀ level (KDT₅₀ of wild population / KDT₅₀ of susceptible strain); Mortality (%): mortality rate 24 h post-exposure; S indicates susceptibility; SR indicates suspicion of resistance that needs to be confirmed; R suggests resistance.
For each insecticide, numbers with different superscript differ significantly at 5% level.

ISSN: 1756-3305