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Table 2 Monthly variation in the frequency of the kdr mutation and the relative prevalence of the two molecular forms of Anopheles gambiae ss in VK7 from July to November 2005

From: Dynamics of multiple insecticide resistance in the malaria vector Anopheles gambiae in a rice growing area in South-Western Burkina Faso

 

S forma

Kdr b

F(R)c

M forma

Kdr b

F(R)c

July

0-

-

-

32 100%

31SS + 1ND

0

August

3 11.5%

3RS

0.50

23 88.5%

3RS+20SS

0.065

September

23 39.0%

22RR+1RS

0.98

36 61.0%

3RR+3RS+30SS

0.125

October

29 46.8%

25RR+3RS+1SS

0.91

33 53.2%

2RS+31SS

0.03

November

28 43.1%

24RR+3RS

0.94

37 56.9%

5RR+7RS+25SS

0.23

Total

83 34.0%

71RR+10RS +2ND

0.93

161 66.0%

8RR+15RS+137SS +1ND

0.097

  1. a Number of mosquitoes analysed, relative prevalence of molecular forms of An. gambiae (in percentage)
  2. b Genotype of the kdr mutation. c Allelic frequency of the kdr mutation in mosquitoes analysed
  3. ND: undetermined
  4. [the global prevalence of the M form is more higher than that of the S form, χ2 = 84.92, df = 1, P < 0.001].