Within 6 pairs of villages, we plan to randomly allocate one village in each pair to receive either ITNs or ITNs plus ITWLs. Households will be randomly selected from each village and all children between the ages of 6 months and 11 years will be enrolled in a cohort study. The children will be cleared of existing infections and then followed monthly until they are found to be infected with malaria. The study will last for 6 months and will demonstrate whether the ITWLs provide additional protection against malaria over that provided by the use of ITNs.