Table 2.
Susceptibility of A. gambiae larvae originating from different types of breeding sites to permethrin and deltamethrin.
| Deltamethrin | Permethrin | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Sites | N | Regression line | LC50 (SE) | LC90 (SE) | RR50 | N | Regression line | LC50 (SE) | LC90 (SE) | RR50 |
| Kisumu strain | 272 | Y = 137X − 0.34 | 0.002 (0.001) | 0.02 (0.003) | 1 | 560 | Y = 54.8X − 3.9 | 0.07 (0.002) | 0.11 (0.005) | 1 |
| Yaoundé lab colony | 516 | Y = 605.4X − 4.97 | 0.008 (0.001) | 0.01 (0.003) | 4 | 636 | Y = 11.96X − 2.8 | 0.24 (0.01) | 0.42 (0.03) | 3.38 |
| Yaoundé | ||||||||||
| Cultivated | 1713 | Y = 4.6X − 2.99 | 0.65 (0.02) | 1.13 (0.04) | 325.5 | 1766 | Y = 6.4X − 4.31 | 0.67 (0.07) | 1.01 (0.12) | 9.57 |
| Polluted | 925 | Y = 4.7X − 1.82 | 0.38 (0.02) | 0.86 (0.04) | 193.5 | 1013 | Y = 5.8X − 3 | 0.52 (0.02) | 0.89 (0.05) | 7.36 |
| Nonpolluted | 3396 | Y = 5.6X − 2.29 | 0.41 (0.01) | 0.81 (0.02) | 205,5 | 3451 | Y = 6.96X − 2.97 | 0.43 (0.01) | 0.74 (0.03) | 6.08 |
| Douala | ||||||||||
| Polluted | 1300 | Y = 5.5X − 2.02 | 0.37 (0.02) | 0.77 (0.03) | 184.5 | 878 | Y = 6.2X − 3.3 | 0.533 (0.03) | 0.89 (0.06) | 7.61 |
| Nonpolluted | 1581 | Y = 4.06X − 1.15 | 0.28 (0.02) | 0.83 (0.04) | 142 | 2239 | Y = 4.7X − 2.5 | 0.527 (0.02) | 0.996 (0.05) | 7.53 |
Sites: refer to the origin of mosquitoes used for bioassays, N: total number of A. gambiae larvae exposed to each insecticide, lethal concentrations killing 50% or 90% of larvae (LC50 and LC90) expressed in mg/liter, SE: standard error, RR50 = LC50 assay/LC50 Kisumu strain. A population is susceptible when RR50 < 2, potentially resistant when 2 < RR50 < 5, resistant when RR50 > 5.