We don’t know that. Before Christmas is a possibility, not certain but possible.
A Covid vaccine could be given to some of the most vulnerable people "this side of Christmas", according to the chairwoman of the UK Vaccine Taskforce.
But limited supplies would mean the government would have to decide who should get it, and when.
Kate Bingham also said a vaccine will not be "a silver bullet" that would allow life to get back to normal overnight.
The head of the UK Vaccine Taskforce says it would not mean that life would get back to normal straight away.
www.bbc.co.uk