It’s a divisive issue across society – and sport is no exception.
The Covid-19 vaccination – recommended by governments and medics across the world – but rejected by vast numbers of leading athletes.
Sarah Mulkerrins, Dan Roan and Ben Rumsby hear from Newcastle goalkeeper Karl Darlow, who caught Covid while unvaccinated and spent three days on a hospital drip.
BBC tennis correspondent Russell Fuller reveals why tennis players are split down the middle over the merits of the jab.
Plus, how unvaccinated athletes in some US sports are becoming second-class citizens in their own dressing-rooms.

Producer: Sam Sheringham Show less