Water Quality and Anopheles gambiae Larval Tolerance to Pyrethroids in the Cities of Douala and Yaoundé (Cameroon)
Table 2
Susceptibility of A. gambiae larvae originating from different types of breeding sites to permethrin and deltamethrin.
Deltamethrin
Permethrin
Sites
Regression line
LC50 (SE)
LC90 (SE)
RR50
Regression line
LC50 (SE)
LC90 (SE)
RR50
Kisumu strain
272
0.002 (0.001)
0.02 (0.003)
1
560
0.07 (0.002)
0.11 (0.005)
1
Yaoundé lab colony
516
0.008 (0.001)
0.01 (0.003)
4
636
0.24 (0.01)
0.42 (0.03)
3.38
Yaoundé
Cultivated
1713
0.65 (0.02)
1.13 (0.04)
325.5
1766
0.67 (0.07)
1.01 (0.12)
9.57
Polluted
925
0.38 (0.02)
0.86 (0.04)
193.5
1013
0.52 (0.02)
0.89 (0.05)
7.36
Nonpolluted
3396
0.41 (0.01)
0.81 (0.02)
205,5
3451
0.43 (0.01)
0.74 (0.03)
6.08
Douala
Polluted
1300
0.37 (0.02)
0.77 (0.03)
184.5
878
0.533 (0.03)
0.89 (0.06)
7.61
Nonpolluted
1581
0.28 (0.02)
0.83 (0.04)
142
2239
0.527 (0.02)
0.996 (0.05)
7.53
Sites: refer to the origin of mosquitoes used for bioassays, : 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.
