Table 2.
Knockdown times of the Kisumu Anopheles gambiae s.s. and wild Anopheles coluzzii strains to insecticides
| Period | Strain | Insecticide | N | KDT50 (min) [CI95] | KDT95 (min) [CI95] | KDT50R |
| December 2013 | Kisumu | 0.05% Deltamethrin | 100 | 9.5 [8.4-10.8] | 17.3 [15.7-19.4] | - |
| 0.75% Permethrin | 100 | 8.8 [7.3-11.1] | 14.0 [12.6-17.8] | - | ||
| 4% DDT | 100 | 19.1 [17.8-21.1] | 31.2 [28.5-33.1] | - | ||
| Manoka | 0.05% Deltamethrin | 114 | 26.6 [25.1-28.1] | 54.5 [50.2-60.2] | 2.8 | |
| 0.75% Permethrin | 100 | >60 | >60 | ND | ||
| 4% DDT | 105 | >60 | >60 | ND | ||
| Youpwe | 0.05% Deltamethrin | 130 | 38.1 [36.4-39.8] | >60 | 4.0 | |
| 0.75% Permethrin | 103 | >60 | >60 | ND | ||
| 4% DDT | 100 | >60 | >60 | ND | ||
| April 2014 | Manoka | 0.05% Deltamethrin | 76 | 40.3 [38.1-43.0] | >60 | 4.2 |
| 4% DDT | 89 | >60 | >60 | ND | ||
| Youpwe | 0.05% Deltamethrin | 71 | 38.7 [36.7-40.8] | >60 | 4.0 | |
| April 2014 | Kisumu | 0.05% Deltamethrin + 4% PBO | 100 | 9.2 [7.8-10.8] | 18.4 [17.2-20.4] | - |
| 0.75% Permethrin + 4% PBO | 100 | 8.8 [7.3-11.1] | 17.2 [16.1-20.6] | - | ||
| 4% DDT + 4% PBO | 100 | 18.1 [16.9-20.8] | 31.0 [28.2-33.4] | - | ||
| Manoka | 0.05% Deltamethrin + 4% PBO | 100 | 25.8 [20.9-30.1] | 54.9 [44.9-78.8] | 2.8 | |
| 0.75% Permethrin + 4% PBO | 100 | 57.0 [54.8-60.0] | >60 | 6.4 | ||
| 4% DDT + 4% PBO | 100 | >60 | >60 | ND | ||
| Youpwè | 0.05% Deltamethrin + 4% PBO | 109 | 22.3 [18.7-26.4] | 36.9 [30.26-56.4] | 2.4 | |
| 4% DDT + 4% PBO | 100 | >60 | >60 | ND |
PBO piperonyl butoxide, N sample size, KDT 50 and KDT 95 knockdown times for 50% and 95% of the tested samples, KDT 50 R ratio KDT50 wild mosquito sample/ KDT50 Kisumu strain; min: minute, ND not determined