Impact of health facility-based insecticide treated bednet distribution in Malawi: progress and challenges towards...

High levels of insecticide treated bednet (ITN) use reduce malaria burden in countries with intense transmission such as Malawi. Since 2007 Malawi has implemented free health facility-based ITN distribution for pregnant women and children <5 years old (under-5s). We evaluated the progress of this targeted approach toward achieving universal ITN coverage.

We conducted a cross-sectional household survey in eight districts in April 2009. We assessed household ITN possession, ITN use by all household members, and P. falciparum asexual parasitemia and anemia (hemoglobin <11 grams/deciliter) in under-5s.

We surveyed 7,407 households containing 29,806 persons. Fifty-nine percent of all households (95% confidence interval [95% CI]: 56-62), 67% (95% CI: 64-70) of eligible households (i.e., households with pregnant women or under-5s), and 40% (95% CI: 36-45) of ineligible households owned an ITN. In households with at least one ITN, 76% (95% CI: 74-78) of all household members, 88% (95% CI: 87-90) of under-5s and 90% (95% CI: 85-94) of pregnant women used an ITN the previous night. Of 6,677 ITNs, 92% (95% CI: 90-94) were used the previous night with a mean of 2.4 persons sleeping under each ITN. In multivariable models adjusting for district, socioeconomic status and indoor residual spraying use, ITN use by under-5s was associated with a significant reduction in asexual parasitemia (adjusted odds ratio (aOR) 0.79; 95% CI: 0.64-0.98; p-value 0.03) and anemia (aOR 0.79; 95% CI 0.62-0.99; p-value 0.04). Of potential targeted and non-targeted mass distribution strategies, a campaign distributing 1 ITN per household might increase coverage to 2.1 household members per ITN, and thus achieve near universal coverage often defined as 2 household members per ITN.

Malawi has substantially increased ITN coverage using health facility-based distribution targeting pregnant women and under-5s, but needs to supplement these activities with non-targeted mass distribution campaigns to achieve universal coverage and maximum public health impact.