Table 2.

Patterns of resistance frequency versus resistance intensity among Anopheles gambiae s.l. populations from Nkolondom, Nkolbisson and Ekié during the three surveys.

Insecticide	Colony	Insecticide Concentration (%)	Resistance Variable	Mortality Rate (%) per Survey Period
				Apr.–May 2018	Dec. 2018–Jan. 2019	Sept.–Oct. 2019
Deltamethrin	Kisumu	0.05dc	F	100	99	100
	Nkolondom	0.05dc	F	16.0	31.7	45.2
		0.510×	I
	Nkolbisson	0.05dc	F	56.7	31.0	4.9
		0.510×	I
	Ekié	0.05dc	F	61.1	30.1	44.6
		0.510×	I
Permethrin	Kisumu	0.75dc	F	98.7	100	99
	Nkolondom	0.75dc	F	8.7	5.6	0.0
		7.510×	I
	Nkolbisson	0.75dc	F	16.3	17.9	5.1
		7.510×	I
	Ekié	0.75dc	F	7.2	10.0	13.9
		7.510×	I
Alpha-cypermethrin	Kisumu	0.05dc	F	100	100	100
	Nkolondom	0.05dc	F	17.8	63.7	3.2
		0.510×	I
	Nkolbisson	0.05dc	F	17.8	32.6	10.7
		0.510×	I
	Ekié	0.05dc	F	11.5	7.5	41.8
		0.510×	I
Etofenprox	Kisumu	0.5dc	F	100	100	99
	Nkolondom	0.5dc	F	9.4	24.1	38.9
		5.010×	I
	Nkolbisson	0.5dc	F	14.3	25.0	76.3
		5.010×	I
	Ekié	0.5dc	F	6.0	30.4	14.4
		5.010×	I
Resistance intensity		Moderate	High Level I	High Level II	High Level III
Mortality rate to 10×		>98%	76–98%	50–75%	<50%

F: resistance frequency (%); dc: standard insecticide diagnostic concentration; I: resistance intensity; 10×: tenfold insecticide diagnostic concentration; Kis. strain: Kisumu strain of Anopheles gambiae s.s.; Apr.–May 2018: April–May 2018; Dec. 2018–Jan. 2019: December 2018–January 2019; Sept.–Oct. 2019: September–October 2019.