 A World Health Organization approved vaccine against malaria is being rolled out in Ivory Coast. This new vaccine is the second of its kind to target malaria, which claims the lives of around half a million people every year, many of them children. But at just around $4 per dose, this jab costs less than half of the original, making it much more affordable in low-income countries. Sir Adrian Hill, a professor of vaccinology at the UK's University of Oxford, led the team that developed the jab