Table 1. Susceptibility of mosquito strains to permethrin-treated papers (0.75%) in WHO cylinder bioassays.

Strains	Slope	LT50$ (minutes)	(95% CI)	LT50 ratio
An. gambiae Kisumu	0.68	<1	–	–
An. gambiae VKPER	1.58	6.92	4.95–9.39	∼7
An. gambiae Akron (wild)*	3.73	19.48	17.05–22.17	∼20

*samples were collected as larvae from breeding sites close to the experimental huts in Akron during the trial,

^$LT50 = time taken for 50% of mosquitoes to be killed.