The Prime Minister Boris Johnson has said “there is no guarantee of a Covid-19 vaccine.”

“I’m hearing some very encouraging things from what’s going on at Oxford to achieve a vaccine [but] this is by no means guaranteed. I believe I’m right in saying that, even after 18 years we still don’t have a vaccine for Sars. What I can tell you is that the UK is at the forefront of concerting international activity to try to deliver a vaccine,” Johnson said.