Urban malaria is emerging as a potential but "avertable" crisis in Africa, scientists are warning. Malaria kills millions around the globe and until recently was believed to be a disease of rural areas, since the Anopheles mosquito - which transmits the deadly parasite between people - breeds in stagnant waters. But now, scientists at the Liverpool School of Tropical Medicine (LSTM) in the UK are issuing a global alert that "urban malaria is a new, emerging tropical disease".