Skip to main content

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