If you get Covid-19 and recover does that mean you are immune to the virus? If you become immune, how long does that immunity last? We are still looking for answers to many of these questions. In the meantime, Dr.…

A serious concern since the emergence of Covid-19 has been whether those who have had it can get it a second time – and what that means for exiting this crisis. The Guardian’s science correspondent Hannah Devlin looks at how…