Indonesia has launched emergency vaccination drives after measles outbreaks killed more than 20 children in two provinces, stoking fears of a wider epidemic amid a global resurgence of the virus.The scale and speed of the outbreak have alarmed health experts, who warn the crisis is not simply the result of faltering immunisation coverage, but also a symptom of growing vaccine hesitancy – fuelled by online misinformation, religious concerns and a legacy of public distrust.This erosion of...