Covid: How will we know if the vaccine is working?

Covid: How will we know if the vaccine is working? More than 15 million people in the UK have received a first dose of coronavirus vaccine - but how will we know if it's working?

There are some early signs of a possible vaccine effect in falling deaths among people aged over 80.

But data on cases and hospital patients is not so clear.

It is hard to separate the effect of the vaccine from that of lockdown. BBC News

See also:

• Covid vaccine impact revealed in over-80s blood tests BBC News
• Another new coronavirus variant seen in the UK BBC News
• Covid: Extra 1.7m vulnerable added to shielding list BBC News
• Covid: Trials test the efficacy of Oxford-AstraZeneca vaccine on children BBC News
• Covid: UK urged to roll out vaccines to EVERYONE over 50 ASAP The Daily Mail
• PHE boss criticised government for doing 'science by press release' The Daily Mail
• Coronavirus UK: People who are shielding 'should stay home until March 31' The Daily Mail
• Contact tracing alone has little impact on curbing Covid spread, report finds The Guardian
• Revealed: NHS could offer Covid vaccine to 32m in priority groups by Easter The Guardian
• Covid: almost 2m more people in England will be asked to shield The Guardian
• Don’t ease lockdown until the NHS can cope, hospital bosses warn The Independent
• NHS staff on what it's like working with 'terrified' Covid patients in intensive care ITV News
• 'Progress' made on vaccine hesitancy amid 'pandemic of disinformation', NHS chief says Sky News