Daily Covid-19 infections have hit record highs in the US, swathes of Europe and Australia as the new Omicron variant of the virus races out of control, keeping workers at home and overwhelming testing centres.
Almost two years after China first reported a cluster of "viral pneumonia" cases in the city of Wuhan, the regularly mutating coronavirus is wreaking havoc in many parts of the world, forcing governments to rethink quarantine and test rules.
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