VACCINE hesitancy is a severe threat to global health, according to the World Health Organisation (WHO). The term refers to the delay in acceptance or the refusal of vaccines, despite the availability of vaccination services. It’s a serious risk to the people who aren’t getting vaccinated as well as the wider community. STEVEN LLOYD WILSON, Assistant Professor of Politics, Brandeis University CHARLES SHEY WIYSONGE, Director, Cochrane South Africa, South African Medical Research Council Vaccine hesitancy is not new. There have been some sceptics ever since vaccination began. Soon after Dr Edward Jenner invented the smallpox vaccine in 1796, rumours started…