 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, and he believes the rollout of the vaccine over the next decade could see yearly deaths come down to around 200,000 and pave the way for what he described as a really serious attempt to eradicate the disease.