Insecticide resistance status in Anopheles gambiae ( s.l. ) in coastal Kenya

Parasites & Vectors

Table 2 Knockdown resistance ratio of mosquito populations (An. gambiae [s.l.]) to different insecticides

Insecticide	Population	KDT₅₀ (in min)	95% CI	KDT₅₀ ratio
Deltamethrin	Jaribuni	18	40.9–55.2	1.1
	Shibe	16	43.9–58.1	0.9
	Kidutani	18	42.9–57.3	1.1
	Ngombeni	23	41.9–56.2	1.4
	Mapawa	32	40.8–61.1	1.9
	Mbogolo	25	39.8–60.2	1.5
	Burangi	–^a	–^a	–^a
	Mangororo	30	39.8–60.2	1.8
Permethrin	Jaribuni	18	39.9–60.2	1.0
	Shibe	21.5	37.9–58.2	1.2
	Kidutani	35.5	38.9–59.2	2.0
	Ngombeni	30	40.8–61.1	1.7
	Mapawa	20	39.8–60.2	1.1
	Mbogolo	27	38.9–59.2	1.5
	Burangi	60	37.9–58.2	3.3
	Mangororo	30	39.8–60.2	1.7
Dichlorodiphenyltrichloroethane (DDT)	Jaribuni	30.5	40.9–55.2	2.1
	Shibe	15	37.9–58.2	1.0
	Kidutani	18	39.8–60.2	1.2
	Ngombeni	27.3	39.8–60.2	1.9
	Mapawa	31.5	39.8–60.2	2.2
	Mbogolo	25	39.8–60.2	1.7
	Burangi	24.4	36.9–57.2	1.7
Bendiocarb	Jaribuni	19.2	43.9–58.1	1.0
	Shibe	19.3	39.8–60.2	1.0
	Kidutani	22	39.8–60.2	1.2
	Ngombeni	26.9	39.8–60.2	1.4
	Mapawa	30	39.8–60.2	1.6
	Mbogolo	23	37.9–58.2	1.2
	Burangi	24	37.9–58.2	1.3
	Mangororo	30	40.8–61.1	1.6
Fenitrothion	Jaribuni	46	37.9–58.1	2.1
	Shibe	23.5	39.8–609.2	1.1
	Kidutani	40	42.8–63.1	1.9
	Ngombeni	31	38.9–59.2	1.5
	Mapawa	21.5	37.9–58.2	1.0
	Mbogolo	46.3	37.9–58.2	2.2
	Burangi	36	36.9–57.2	1.7

CI, Confidence interval; KDT₅₀, time taken for 50% of the test population to be knocked down; KDT₅₀ ratio, KDT₅₀ of the test population to that of the control (Kisumu strain)
^aLower limit estimation not possible due to a large g value [40]

ISSN: 1756-3305