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Table 3 Summary results of the bioassays with permethrin 0.75%

From: Insecticide resistance in malaria vectors along the Thailand-Myanmar border

Taxa N a % Mortalityb % KDc KDT50d Statuse
An. scanloni (laboratory strain) 50 100 (na) 98 (94–100) 25.6 (24.2–27) S
An. minimus (s.s.) (laboratory strain) 50 100 (na) 100 (na) 13.5 (11.5–15.3) S
An. annularis (s.l.) 0 na na na na
An. barbirostris (s.l.) 493 84 (81–88) 90 (88–93) 26.6 (25.8–27.5) R
An. hyrcanus (s.l.) 154 48 (40–56) 32 (24–39) 116.2 (83–212.1) R
An. jamesii (s.l.) 54 98 (95–100) 100 (na) 11.3 (10.3–12.2) S
An. kochi 0 na na na na
An. maculatus (s.l.) 264 97 (95–99) 97 (95–99) 16.7 (15.6–17.8) SR
An. minimus (s.l.) 340 98 (96–99) 99 (98–100) 15 (14.4–15.6) S
An. tessellatus 0 na na na na
An. vagus 178 95 (92–98) 100 (na) 15.3 (14.3–16.3) SR
  1. a N: number of mosquito
  2. b % Mortality: mortality rate (expressed in %) after 1 h of exposure to insecticide, recorded following a 24 h observation period; the values between parentheses indicate the 95% confidence interval of the mean mortality rate
  3. c % KD: rate of mosquitoes “knocked down” (KD, expressed in %) recorded after 1 h of exposure to insecticide; the values between parentheses indicate the 95% confidence interval of the mean KD rate
  4. d TKD50: time (expressed in minutes) necessary to “knock down” 50% of the mosquitoes; the values between parentheses indicate the 95% confidence interval of the TDKD50
  5. e Status: resistance status as defined by WHO [37]. Briefly, a mortality in the range 98–100% indicates susceptibility; a mortality between 90 and 97% indicates suspected resistance; a mortality < 90% indicates confirmed resistance as long as 100 specimens have been phenotyped
  6. Abbreviations: na, not applicable; R, resistant; S, suceptible; SR, suspected resistance