<p>A student holds a swab which is part of a lateral flow test at Swansea University</p>

University students returning to their homes over Christmas could have caused thousands of additional coronavirus infections, the model said.

Cardiff University mathematicians found that coronavirus-infected students returning home from university during the holiday period would, on average, have infected about one other household member with the virus.

The researchers said there were possibly 10,000 additional Covid cases – and possibly many more.

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