Africa needs up to $2.5 billion a year to fight malaria, or 10 times the donor funds pledged for a campaign against the disease, the World Health Organization said Tuesday. The mosquito-borne disease kills more than 1 million people a year around the world -- more than 90 percent of them in sub-Saharan Africa, the WHO said in a statement issued from its regional office in Brazzaville, Republic of Congo.