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Table 2 Indoor residual spraying efficacy and indoor to outdoor biting ratio shown for each geography (district), season (rainy versus dry) and anopheline species

From: To spray or target mosquitoes another way: focused entomological intelligence guides the implementation of indoor residual spraying in southern Mozambique

  Rainy season Dry season
Indoor:outdoor biting ratioa Minimum IRS efficacy Maximum IRS efficacy Indoor:outdoor biting ratioa Minimum IRS efficacy Maximum IRS efficacy
Bilene (Gaza)
 An. funestus s.l ND ND ND 4.69:0.77 0.74 1.56
 An. gambiae s.l ND ND ND 0:0.31 0.35 0.65
 An. ziemanni ND ND ND 0.08:0.08 0b 0b
Chokwe (Gaza)
 An. funestus s.l 0.75:0 0.12 0.91 0.21:0.05 2.50 2.81
 An. gambiae s.l 1.30:0 0 0.18 0.11:0.58 0 0.06
 An. tenebrosus 0.73:0 0.05 0.93 0.42:0.68 0.14 0.21
 An. pharoensis 0.18:0 0 0.17 0:0.11 0.36 0.36
 An. ziemanni 0.48:0 0 0.15 0.16:0.21 0.38 0.38
Cidade de Xai Xai (Gaza)
 An. funestus s.l 0:0.44 0b 0b 0.09:0.09 0b 0b
 An. gambiae s.l 0.09:0 5.56 5.56
 An. tenebrosus 3.78:0.56 0b 0b 0.45:2.18 0b 0b
 An. ziemanni 1.00:0.22 0b 0b 0.09:0.36 0 0.38
 An. pharoensis 0:0 0c 0c
Cidade de Imhambane (Inhambane)
 An. funestus s.l 1.38:1.31 0.44 0.54 1.38:0.62 0.40 0.57
 An. gambiae s.l 0.12:0.19 0b 0b 0:0.13 0b 0b
 An. tenebrosus 0.06:0.44 0b 0b 0:0.88 0b 0b
 An. ziemanni 0:0.12 0b 0b 0:0.50 0b 0b
Jangamo (Inhambane)
 An. funestus s.l 6.31:0 0.22 0.54 1.71:0.93 0.46 1.06
 An. gambiae s.l 0.89:0 0.33 0.33
 An. tenebrosus 0:0 0c 0c
Massinga (Inhambane)
 An. funestus s.l 1.89:1.44 0.32 0.32 0.87:0.47 1.07 1.59
 An. tenebrosus 0:0.20 0b 0b
 An. ziemanni 0:0.13 0b 0b
  1. ND means ‘not determined’; – signifies zero mosquitoes in any of the collection methods
  2. ahighest value highlighted in bold
  3. bfeeding indoors and/or outdoors, but not found resting and/or exiting
  4. cresting and/or exiting but not found feeding indoors and/or outdoors