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Table 2 Summary results of the bioassays with deltamethrin 0.05%

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) 100 (na) 19.6 (18.4–20.7) S
An. minimus (s.s.) (laboratory strain) 50 100 (na) 100 (na) 10.4 (9.4–11.4) S
An. annularis (s.l.) 40 100 (na) 100 (na) 14.4 (13.1–15.6) S
An. barbirostris (s.l.) 504 72 (68–76) 85 (82–88) 30.5 (28.7–32.4) R
An. hyrcanus (s.l.) 172 33 (26–40) 27 (20–33) 131.3 (83–378.1) R
An. jamesii (s.l.) 111 87 (81–94) 97 (94–100) 14 (11.7–16.2) R
An. kochi 43 98 (93–100) 100 (na) 14.6 (13–16) S
An. maculatus (s.l.) 280 85 (81–89) 89 (85–93) 18.8 (15.8–21.6) R
An. minimus (s.l.) 370 92 (89–94) 99 (98–100) 15.4 (14.3–16.5) SR
An. tessellatus 83 98 (94–100) 99 (96–100) 17.7 (16.6–18.8) S
An. vagus 148 75 (68–82) 95 (91–98) 21.3 (19–23.4) R
  1. a N: number of mosquito phenotyped
  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