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Table 2 Knockdown times of the Kisumu Anopheles gambiae s.s. and wild Anopheles coluzzii strains to insecticides

From: Anopheles coluzzii larval habitat and insecticide resistance in the island area of Manoka, Cameroon

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
  1. 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