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Malaria, which is spread by mosquito bites, kills nearly half a million people a year. After years of research and development, the first ever vaccine against malaria will be introduced in a pilot project in Ghana, Kenya and Malawi from 2018. Doctor Matshidiso Moeti is the the World Health Organisation's regional director for Africa.

(Photo: The Anopheles mosquito, which carries the Malaria parasite. Credit: Getty Images)