Most people who catch and recover from COVID-19 are likely to be immune for several months afterwards, a study of more than 20,000 health-care workers in the United Kingdom has found.

The study — called SARS-CoV-2 Immunity and Reinfection Evaluation (SIREN) and published on the preprint server medRxiv on 15 January1 — concluded that immune responses from past infection reduce the risk of catching the virus again by 83% for at least 5 months.

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