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Table 4 Summary results of the bioassays with DDT 4%

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

Taxa

N a

% Mortalityb

% KDc

KDT50d

Statuse

An. scanloni (laboratory strain)

50

84 (74–94)

42 (28–56)

63.2 (59.8–69.7)

S

An. minimus (s.s.) (laboratory strain)

50

100 (na)

98 (94–100)

38.3 (36.9–39.7)

R

An. annularis (s.l.)

0

na

na

na

na

An. barbirostris (s.l.)

435

74 (70–78)

49 (45–54)

61 (59.1–63.2)

R

An. hyrcanus (s.l.)

91

57 (47–67)

30 (20–39)

84.2 (70.9–112.1)

R

An. jamesii (s.l.)

59

98 (95–100)

88 (80–96)

33.3 (31.3–35.2)

S

An. kochi

0

na

na

na

na

An. maculatus (s.l.)

239

99 (97–100)

9 (94–99)

25.5 (23.4–27.4)

S

An. minimus (s.l.)

245

100 (na)

100 (na)

23.4 (21.8–24.9)

S

An. tessellatus

0

na

na

na

na

An. vagus

133

97 (94–100)

91 (86–96)

35.3 (34–36.6)

SR

  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