The best way to win the battle against Covid is to vaccinate the whole world, but in poorer countries, not enough people are getting the job. Only six and a half per cent of the population in low-income countries are fully protected. There are now enough vaccines being made for everyone on the planet, so why aren’t they being shared more fairly? Reporter Bronagh Munro investigates why the global vaccine rollout is failing and asks if governments and big drug companies could do more to keep us all safe.