Ambulances queue at the Royal London Hospital on Jan. 13, 2021, during England's third national lockdown to curb the spread of COVID-19. (Photo: AP-Yonhap News)
A British study has found that most people who have had COVID-19 are protected from getting it again for at least five months, but may still carry and transmit the virus.
The BBC's Rebecca Morelle explains.
This is one of the biggest studies of its kind.
Scientists tracked more than six and a half thousand healthcare workers who'd been infected with coronavirus, and regularly tested them to see how many caught it again.
Most were protected from the virus for at least five months, the duration of the study so far.
And they will continued to be monitored to see how long this immunity lasts.
But there were a small number of reinfections.
Forty-four potential cases were detected.
About half had no symptoms, but a few had high enough levels of the virus to put them at risk of spreading it to others.
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