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Table 2 Knock-down times and mortality rates of field collected Aedes aegypti mosquitoes exposed to 0.05% lambdacyhalothrin, 0.75% permethrin and 0.05% lambdacyhalothrin using WHO standard bioassay

From: Habitat productivity and pyrethroid susceptibility status of Aedes aegypti mosquitoes in Dar es Salaam, Tanzania

Insecticide

Site

(N)

Replicates

Mean mortality (%) ± SD

KDT50 (Min.)

95% CI

KDT95 (Min.)

95% CI

Status

0.05% Deltamethrin

Kigogo

160

8

90.6 ± 1.8

30

24.6–36.8

90.9

64.6–178.9

R*

Kipawa

160

8

92.5 ± 0.9

24.9

21.7–28.3

55.2

45.8–73.7

R*

Msasani

160

8

87.5 ± 1.3

29.9

24.0–30.1

78.7

64.1–105.9

R

Sinza

160

8

96.8 ± 0.9

26

22.8–29.4

60.1

49.8–80.1

R*

Mikocheni

160

8

86.3 ± 1.9

24.9

21.3–28.6

58.5

47.4–82.3

R

Kigamboni

160

8

91.9 ± 1.1

30.3

27.0–33.9

65.9

55.1–86.4

R*

0.75% Permethrin

Kigogo

160

8

86.8 ± 1.2

30.9

28.1–34.0

68.1

58.2–85.4

R

Kipawa

160

8

83.1 ± 2.1

34.4

30.6–39.0

94.6

74.9–35.9

R

Msasani

160

8

85.0 ± 1.3

32.1

27.9–36.9

71.2

57.4–102.5

R

Sinza

160

8

96.2 ± 0.9

24.3

21.0–27.6

54.3

44.8–73.4

R*

Mikocheni

160

8

88.1 ± 1.4

33.7

28.1–41.1

89.3

65.3–164.2

R

Kigamboni

160

8

91.2 ± 1.0

29.3

27.0–31.7

67.1

58.6–80.4

R*

0.05% Lambdacyhalothrin

Kigogo

160

8

86.3 ± 1.4

29.2

27.9–30.6

67.2

61.8–74.1

R

Kipawa

160

8

85.6 ± 2.1

26.7

22.7–31.0

64.5

51.5–94.1

R

Msasani

160

8

85.0 ± 0.7

32.8

31.5–34.3

69

63.9–75.7

R

Sinza

160

8

83.8 ± 0.7

30.7

27.5–34.3

76

62.8–101.1

R

Mikocheni

160

8

84.4 ± 0.6

27.9

25.6–30.4

69.2

59.8–84.2

R

Kigamboni

160

8

83.1 ± 0.7

29.3

27.9–30.7

69.6

64.8–77.2

R

  1. N number of samples, CI confidence interval, SD standard deviation, KDT knock-down time, KDT50 time taken for 50% of the test mosquitoes to knock down, KDT95 time taken for 95% of the test mosquitoes to knock down. S; Full susceptible (observed mortality 98–100%) R*; Suspected resistance needs to be confirmed (mortality 90–97%) and R; Resistance (observed mortality < 90%)