 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