Experimental hut evaluation of bednets treated with an organophosphate (chlorpyrifos-methyl) or a pyrethroid (lambdacyhalothrin) alone and in combination against insecticide-resistant Anopheles gambiae and Culex quinquefasciatus mosquitoes

Table 2 Acetylcholinesterase genotypes as determined by PCR on Anopheles gambiae collected from the experimental huts.

Type of Treatment	Live/dead at collection	Ace 1^R/Ace1^R No.	Ace 1^R/Ace 1^S		Ace 1^S/Ace 1^S
			No.	% survival	No.	% survival
Untreated Control	live	0	27	64%^a	9	100%^b
	dead	0	15		0
	total	0	42		9
Chlorpyrifos- methyl	live	1	23	26%^c	11	46%^c
	dead	1	65		13
	total	2	88		24
Lambda- cyhalothrin	live	0	16	34%^c	2	14%^c
	dead	0	31		12
	total	0	47		14
Mixture & two-in-one	live	0	21	47%^c	1	17%^c
	dead	0	45		5
	total	0	66		6

Note percentages accompanied by different letter superscripts differ significantly by χ² or Fisher's exact test

ISSN: 1475-2875