Table 3.
Summary results of the bioassays with permethrin 0.75%
| 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 |
a N: number of mosquito
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
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
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
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
Abbreviations: na, not applicable; R, resistant; S, suceptible; SR, suspected resistance