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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%)