Insecticide resistance in Anopheles gambiae from south-western Chad, Central Africa

Malaria Journal

Table 1 Knockdown times (KDT) and mortality rates of An. gambiae s.l. populations exposed to 0.05% deltamethrin

District	Village	N	Mortality (%)	% KD after 1 h exposure	KDT₅₀ in min (95% CI)	KDT₉₅ in min (95% CI)	KDT₅₀R*
Bongor	Bongor	91	72.5⁽³⁾	93.4	27.5 (26.0–29.0)	72.5 (65.7–81.7)	1.70
	Goulmoun	85	72.9⁽³⁾	100	17.1 (16.1–18.1)	34.4 (32.0–37.5)	1.05
	Tchinfogo	94	70.2⁽³⁾	100	15.5 (14.7–16.3)	27.4 (25.6–29.7)	0.96
Guelendeng	Guelendeng	91	98.9⁽¹⁾	100	13.4 (12.5–14.3)	29.0 (26.8–31.8)	0.83
	Mbéré	89	86.5⁽²⁾	100	11.2 (9.9–12.4)	20.4 (18.0–24.5)	0.69
	Witi-Witi	89	96.6⁽²⁾	100	9.5 (8.7–10.2)	20.3 (18.5–22.7)	0.59
Kélo	Kélo	100	88.0⁽²⁾	98.0	12.8 (11.8–13.7)	35.2 (32.3–38.9)	0.79
	Bologo	87	85,1⁽²⁾	96.6	25.2 (24.0–26.4)	50.6 (47.3–54.8)	1.56
	Kolon	99	74.8⁽³⁾	100	21.3 (20.4–22.2)	36.3 (34.3–38.7)	1.31
Kisumu Susceptible strain		82	100⁽¹⁾	100	16.2 (14.6–17.7)	29.9 (26.7–34.9)

* KDT₅₀R: KDT₅₀ of the tested population divided by KDT₅₀ of the Kisumu reference strain (1): susceptible; (2): resistance suspected; (3): resistant (WHO, 1998)

ISSN: 1475-2875