London, UK. 20th Dec, 2021. An alert from the NHS Covid app saying 1 day left of self-isolation following contact with a person later diagnosed with covid. The spread of the coronavirus variant omicron has been rapid in the UK and is causing problems in the NHS because so many staff are off sick or self-isolating. Credit: Anna Watson/Alamy Live News

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Photo credit: © Anna Watson / Alamy / Afripics
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