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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