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Table 4 Infectiousness of Anopheles arabiensis and Anopheles funestus mosquitoes caught indoors and outdoors the rice farms

From: Protecting migratory farmers in rural Tanzania using eave ribbons treated with the spatial mosquito repellent, transfluthrin

 

Indoors

Outdoors

Anopheles arabiensis

Anopheles funestus

Anopheles arabiensis

Anopheles funestus

Total mosquitoes analysed

4465

5145

306

868

Number of households

24

24

24

24

Number of trapping nights

69

69

69

69

Mosquito/household/night

2.70

3.11

0.18

0.52

Corrected biting rate

3.53

3.29

0.03

0.63

Plasmodium positive mosquitoes

1

10

0

3

Sporozoite rate

0.0002

0.0019

0

0.0035

EIR

0.0006

0.0060

0

0.0018

Annual EIR

0.2204

2.2041

0

0.6612

Corrected EIR

0.0008

0.0064

0

0.0022

Corrected Annual EIRa

0.2887

2.3363

0

0.7935

EIR contribution indoors and outdoors

9%

91%

0

100%

Corrected EIR contribution indoors and outdoors

4%

96%

0

100%

Overall EIR contribution

7%

71%

0

22%

Overall corrected EIR contribution

3%

64%

0

33%

  1. Corrected biting rate indoor = mosquito/household/trap × relative efficacy of CDC-LT to HLC [53], i.e., 0.3 for An. arabiensis and 0.68 for An. funestus Corrected biting rate outdoor = mosquito/household/trap × relative efficacy of BGM to HLC [54], i.e., 0.16 for An. arabiensis and 1.2 for An. funestus
  2. aSince farmers typically spend less than half a year in the farms, actual infection intensities would be less than half of these estimates