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Table 5 Plasmodium infectious status of primary malaria vectors collected indoors and outdoors in Ifakara town and estimates of the entomological inoculation rates, as contributed by the vector species

From: Dramatic decreases of malaria transmission intensities in Ifakara, south-eastern Tanzania since early 2000s

  Anopheles arabiensis Anopheles funestus
Indoors Outdoors Overall estimates Indoors Outdoors Overall estimates
Total no. Anopheles caught (all traps)a 3543 4252 7795 252 148 400
Total no. Trap nights 1792 1780 3572 1792 1780 3572
Total no. Anopheles analyzed for CSP 3543 4252 7795 252 148 400
Total no. sporozoite-positive Anopheles 0 0 0 0.00 1 1
Annual PfEIR 0.00 0.00 0.00 0.00 0.205 0.102
% PfEIR contribution by species 0% 100%
  1. Since all Anopheles collected in this survey were analysed for Plasmodium infection, no differences were expected between overall PfEIR estimations obtained by either the standard or the alternative method as described by Drakeley et al. [13]
  2. aIn this table, only the alternative method is used to calculate PfEIR. The only sporozoite positive mosquito was that captured by human landing catches (HLC), so no adjustments on the other traps were done as they would have marginal effect on overall PfEIR estimates, which would be zero nonetheless. Instead, we have considered PfEIR estimates without any adjustments and assumed similar trap efficacies. If only outdoor An. funestus catches were considered, the PfEIR was estimated at double the overall, but these are still very low and only detectable marginally by HLC