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Table 3 Standardised WHOPES cone tests for permethrin-treated (0.52%) and untreated fabric, both before and after use in the field

From: Field evaluation of personal protection methods against outdoor-biting mosquitoes in Lao PDR

Mosquito species Fabric treatment Before/after fieldworka Total no. exposed KD after exposure (95% CI) KD 1 h after exposure (95% CI) Mortality after 24 h (95% CI)
Aedes albopictus IPL strain Untreated New 239 0.8 (-0.3–2.0) 0 2.5 (-0.1–5.1)
After (2 weeks) 242 0 0 1.6 (0–3.3)
After (4 weeks) 239 2.9 (1.4–4.4) 8.1 (5.7–10.6) 2.5 (1.1–3.9)
Permethrin-treated New 240 13.8 (7.9–19.6) 40.4 (32.1–48.8) 25.0 (17.8–32.2)
After (2 weeks) 238 2.9 (0.8–5.1) 43.3 (36.9–49.6) 26.5 (20.8–32.1)
After (4 weeks) 239 3.4 (1.1–5.6) 44.8 (38.4–51.1) 30.1 (24.3–36.0)
Aedes aegypti USDA strain Untreated New 240 0 0 0.4 (-0.4–1.3)
After (2 weeks) 240 0 0 0.4 (-0.4–1.2)
After (4 weeks) 241 0 0 0.8 (0.0–2.0)
Permethrin-treated New 238 4.5 (0.4–8.5) 71.3 (63.6–78.9) 26.2 (16.7–35.8)
After (2 weeks) 240 5.8 (2.8–8.8) 46.3 (39.9–52.6) 20.8 (15.7–26.0)
After (4 weeks) 239 7.5 (4.2–10.9) 31.4 (25.5–37.3) 25.1 (19.6–30.6)
  1. Note: Results are shown with 95% confidence interval (CI). KD is the knockdown three minutes after exposure, KD 1 h is the knockdown 1 h after exposure
  2. aTwo weeks of fieldwork were undertaken in Silalek village for afternoon comparisons and four weeks of fieldwork were undertaken in Thinkeo village for evening comparisons