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

Malaria Journal

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

	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%

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]
^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

ISSN: 1475-2875