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Table 4 Susceptibility of wild An. arabiensis mosquitoes collected in two wards in the study area, i.e. Katindiuka and Viwanja Sitini, (Fig. 1)

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

Insecticide tested Katindiuka ward Viwanja Sitini ward
N Mortality (%) Class N Mortality (%) Class
0.75% permethrin 100 37 Resistant 100 37 Resistant
0.05% deltamethrin 100 39 Resistant 100 36 Resistant
0.05% lambda-cyhalothrin 100 32 Resistant 100 34 Resistant
4% DDT 100 41 Resistant 100 65 Resistant
0.1% bendiocarb 100 100 Susceptible 100 100 Susceptible
0.25% pirimiphos methyl 100 54 Resistant 100 70 Resistant
5% malathion 100 100 Susceptible 100 99 Susceptible
Control (untreated paper) 100 0 N/A 100 0 N/A
  1. The assays were conducted using WHO 2013 guidelines for testing insecticide resistance in malaria vectors [39]
  2. In tests conducted on the susceptible An. gambiae s.s. (Ifakara strain) used as an additional control, full susceptibility (100% mortality) was observed