In the next six years, the number of Tanzanians killed by malaria could be halved. They just need to start using insecticide-treated nets. "Treated nets can reduce mosquito bites by more than 80 percent and kill more than 50 percent of all mosquitoes that enter houses," Alex Mwita, manager of Tanzania's National Malaria Control Programme, said. Medical experts say the use of bed nets would cut the number of children killed by the disease by 27 percent.