Table 1 Insecticide susceptibility of An. gambiae (s.l.) from two study sites in Kome, southern Chad exposed to WHO diagnostic doses for nine insecticides (knockdown at 60 min and percent mortality at 24 h)
Insecticide | No. tested | Site A | Site B | ||
|---|---|---|---|---|---|
% knockdown at 60 min (95 % CI) | % 24 h mortality (95 % CI) | % knockdown at 60 min (95 % CI) | % 24 h mortality (95 % CI) | ||
Permethrin, 0.75 % | 100 | 36.7 (35.9–37.4) | 31.7 (29.0–34.3) | 37.6 (36.4–38.9) | 26.7 (25.9–27.4) |
Lamdacyhalothrin, 0.05 % | 100 | 33.3 (30.7–35.9) | 48.3 (45.5–51.1) | 25.4 (22.8–27.2) | 32.2 (27.6–35.7) |
Deltamethrin, 0.05 % | 100 | 76.6 (72.7–80.5) | 73.3 (69.4–77.2) | 76.7 (75.9–77.4) | 56.7 (55.9–57.4) |
DDT, 4.0 % | 100 | 33.3 (31.4–35.2) | 20.0 (18.7–21.3) | 41.7 (39.8–43.6) | 40.0 (38.7–41.3) |
Fenithrothion, 1.0 % | 100 | – | 100 (100–100) | – | 100 (100–100) |
Malathion, 5 % | 100 | – | 100 (100–100) | – | 100 (100–100) |
Pirimiphos methyl, 0.9 % | 100 | – | 100 (100–100) | – | 98.3 (97.6–99.0) |
Propoxur, 0.1 % | 100 | – | 41.7 (34.6–48.7) | – | – |
Bendiocarb, 0.1 % | 100 | – | 21.7 (19.8–23.6) | – | 20.3 (19.3–21.6) |