A new $65 million initiative to boost malaria control and combat resistance to insecticides by improving access to new, low-cost anti-mosquito sprays across Africa was announced on Monday. The initiative by the health agency UNITAID and non-profit group IVCC will be rolled out over four years with a goal of protecting as many as 50 million people in 16 African countries. Although effective in fighting malaria, the indoor spraying of walls has fallen by 40 percent in the past four years due to increased resistance to older products and high cost of new alternatives, UNITAID and IVCC said.