Health leaders in the UK are warning Covid-related staff shortages are causing major challenges, with patient capacity reduced.
At least six hospital trusts have now declared a critical incident, putting some services at risk.
Staffing shortages are affecting other public services too - several rail operators are running reduced timetables.
Dr Layla McKay, from the NHS Confederation, says some trusts have 10 percent of staff off because of covid illness or isolation.
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