Global funding for malaria control has risen dramatically over the past decade, thanks to campaigns from aid groups and prominent advocates, but according to a new study, efforts to combat the disease have so far yielded only modest results. In a paper published today in the Lancet medical journal, researchers write that up to 57 percent of Africas population remains at moderate or high risk of contracting the deadliest form of malaria, despite significant drops in transmission rates over the past ten years. There were 219 million malaria cases worldwide in 2010, according to estimates from the World Health Organization (WHO), resulting in about 660,000 deaths. It can be treated with antimalarial drugs, but receiving medicines or even bed nets can be difficult for those living in impoverished areas, and especially in sub-Saharan Africa.