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. They were tested by ELISA for sporozoites. Incidence of @entity281 was measured by clearing existing infections from @entity1 with @entity68989 and then taking weekly blood samples. Prevalence of @entity281 and fever, @entity417 and @entity381 were measured in @entity1 of different age groups. All these measurements were made in highland and lowland areas of Tanzania before and after provision of bednets treated with @entity5179 . RESULTS: Entomological inoculation rates (EIR) were about 17 times greater in a lowland than a highland area, but incidence of @entity281 only differed by about 2.5 times. @entity311 morbidity was significantly less prevalent in the highlands than the lowlands. Treated nets in the highlands and lowlands led to 69-75% reduction in EIR. @entity311 morbidity showed significant decline in younger @entity1 at both altitudes after introduction of treated nets. In @entity1 aged 6-12 the decline was only significant in the highlands CONCLUSIONS: There was no evidence that the health benefits to young @entity1 due to the nets in the lowlands were "paid for" by poorer health later in life. Our data support the idea of universal provision of treated nets, not a focus on areas of natural hypo-endemicity.

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

@entity1 :: ('9606', 'Species') :: ['children'] @entity417 :: ('MESH:D000740', 'Disease') :: ['anaemia'] @entity5179 :: ('MESH:C017160', 'Chemical') :: ['alphacypermethrin'] @entity281 :: ('MESH:D007239', 'Disease') :: ['infection', 'malaria infection'] @entity381 :: ('MESH:D013163', 'Disease') :: ['splenomegaly'] @entity311 :: ('MESH:D008288', 'Disease') :: ['Malaria'] @entity68989 :: ('MESH:C519882', 'Chemical') :: ['chlorproguanil-dapsone']
@entity5179 :: (MESH:C017160,Chemical) :: ['alphacypermethrin']
