Table 1.
Time required for 50% of the population to be knocked down (LT50) and resistance ratio relative to the susceptible strain (RR50) of different age groups of wild An. gambiae mosquitoes from Tiassalé following exposure to five insecticides
| Insecticide | Age (days) | LT50 | 95% confidence interval | RR50 |
|---|---|---|---|---|
| Deltamethrin |
*Kisumu (1–2) |
15.18 |
(14.45-15-88) |
1 |
| |
1 |
62.28 |
(57.46-71.03) |
4.1 |
| |
2 |
80.93 |
(69.37-102.37) |
5.33 |
| 3 |
73.23 |
(65.20-86.94) |
4.82 |
|
| 5 |
72.7 |
(65.42-85.32) |
4.79 |
|
| 10 |
45.67 |
(43.84-47-90) |
3.01 |
|
| Permethrin |
Kisumu (1–2) |
14.59 |
(13.96-15.20) |
1 |
| |
1 |
164.04 |
(105.91-497.81) |
11.24 |
| 2 |
179.01 |
(109.02-743.01) |
12.27 |
|
| 3 |
193.31 |
(112.62-951.82) |
13.25 |
|
| 5 |
129.18 |
(94.19-292.32) |
8.85 |
|
| 10 |
69.64 |
(63.50-79.50) |
4.77 |
|
| DDT |
Kisumu (1–2) |
21.37 |
(20.70-21.03) |
1 |
| |
1 |
+∞ |
na |
na |
| |
2 |
+∞ |
na |
na |
| |
3 |
+∞ |
na |
na |
| |
5 |
201.2 |
(115.24-1129.87) |
9.42 |
| |
10 |
+∞ |
na |
na |
| Malathion |
Kisumu (1–2) |
24.93 |
(24.11-25.73) |
1 |
| |
1 |
61.79 |
(56.86-69.04) |
2.48 |
| |
2 |
54.66 |
(51.22-59.37) |
2.19 |
| |
3 |
63.76 |
(58.59-71.63) |
2.56 |
| |
5 |
38.31 |
(35.99-41.13) |
1.54 |
| |
10 |
48.77 |
(46.08-52.24) |
1.96 |
| Propoxur |
Kisumu (1–2) |
27.09 |
(26.06-28.09) |
1 |
| |
1 |
+∞ |
na |
na |
| |
2 |
+∞ |
na |
na |
| |
3 |
+∞ |
na |
na |
| |
5 |
64.61 |
(56.97-78.75) |
2.39 |
| 10 | 74.61 | (67.48-89.31) | 2.75 |
*Reference susceptible An. gambiae s.s. strain aged 1 to days old; na: not available; +∞: infinity.