Oxford scientists working on a coronavirus vaccine say there is now only a 50% chance of success because the number of UK cases is falling too quickly

Oxford scientists working on a coronavirus vaccine say the chances of success are now 50%. They say that's because the number of people with the virus in the UK is falling too quickly. "At the moment, there's a 50% chance that we get no result at all," scientist Adam Hill said this weekend. His colleague Sir John Bell said vaccine scientists might have to "chase" COVID-19 around Britain.