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Malaria is no stranger to Africa, but largely keeps out of urban centres as it’s difficult for the mosquitoes carrying the parasites to survive there. Now Anopheles Stephensi, an Asian mosquito that is better adapted to life in the city, is threatening to move in. Marianne Sinka, an entomologist at the University of Oxford in the UK, has been looking at how and where it might spread. (Image: Anopheles Stephensi, Credit: Getty Images.)