Variation of malaria transmission and morbidity with altitude in Tanzania and with introduction of alphacypermethrin treated nets.

Background: Highland areas with naturally less intense malaria transmission may provide models of how lowland areas might become if transmission was permanently reduced by sustained vector control. It has been argued that vector control should not be attempted in areas of intense transmission.

Methods: Mosquitoes were sampled with light traps, pyrethrum spray and window exit traps.