Many people all over the world have now had one infection with covid-19 – how does that affect their future chance of a second round with the coronavirus?
Health
8 December 2021
A healthcare worker does tests that detect antibodies to the coronavirus Peter Kovalev/TASS via Getty Images
For the past year there has been great interest in measuring how much protection the covid-19 vaccines give against infections and severe illness – and now the focus has turned to how the vaccines will fare against the new omicron variant. But there is another question about immunity that is relevant: how much is provided by a previous covid-19 infection?
Two years after the pandemic began, there have been about 250 million confirmed coronavirus infections around the world, although the real …