Multiple hospitals have declared critical incidents amid warnings the NHS is “in a state of crisis” in the face of staff shortages caused by coronavirus and rising pressures.

In a letter to Health Secretary Sajid Javid, the Royal College of Nursing (RCN) said the NHS can “ill afford” the current level of absences as it called for a “more cautious approach” to COVID restrictions in England “without further delay”.

The union, which has more than 465,000 members, also questioned the “confusing and concerning” differences in coronavirus measures in the different UK nations.

It said there were “significant concerns” about staffing plans for the new “Nightingale surge hubs”, which will look after people who are not well enough to go home but need minimal supervision during their COVID recovery.

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“It is confusing and concerning that the different UK governments have set out their own different rules and regulations in relation to the management of the pandemic,” the RCN says.

“Nursing professionals are questioning the level and nature of the variation between governments.”

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The RCN urged ministers to introduce “a more cautious approach for England without further delay”, saying this was supported by “high levels of staff absence due to COVID-19”.

NHS staff absences in England due to coronavirus doubled in the two weeks to Boxing Day, the union said.

“The health and care system in England, already short tens of thousands of professionals, can ill afford the current losses,” it added.

Prime Minister Boris Johnson has warned that the Omicron variant “continues to surge through the country” and pressure on the NHS would last for weeks.

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‘Absolute folly’ to say pandemic is over

But cracks were already beginning to show as six NHS trusts had reportedly declared “critical incidents” – where bosses are concerned they may not be able to provide priority services – on Monday evening.

The chief executive of the NHS Confederation, Matthew Taylor, said that “in many parts of the health service, we are currently in a state of crisis”.

“Some hospitals are making urgent calls to exhausted staff to give up rest days and leave to enable them to sustain core services,” he said.

Chris Hopson, chief executive of NHS Providers, which represents health trusts, said “a number of trusts across the country have declared internal critical incidents over the last few days”.

One of those was United Lincolnshire Hospitals NHS Trust, where “extreme and unprecedented” staff shortages were expected to result in “compromised care”.

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COVID admissions rise in over-50s

Chief executive of University Hospitals of Morecambe Bay, Aaron Cummins, also confirmed in a statement that the trust had declared an “internal critical incident”.

In an internal message from Mr Cummins shared on Twitter, he told staff that “sadly, despite everyone’s best efforts, many of our patients are still receiving a level of care and experience that falls below the level of standards we would like”.

And he added that some non-urgent operations and procedures would be suspended.

Mr Johnson said he appreciated the pressure NHS staff were under, and that it was “vital that we make sure that we help them by trying to contain the pandemic” by getting vaccinated and following plan B measures.

And he warned it would be “absolute folly” to say the pandemic is over.

In an attempt to stem the spread of Omicron, secondary school pupils in England will be urged to again wear face masks in the classrooms, and need to take twice-weekly tests.

A further 157,758 coronavirus cases and 42 COVID-related deaths were recorded in the latest 24-hour period, official figures show.

The deaths data only covers England, whilst the number of cases includes Scotland, but not Wales and Northern as they do not report COVID-19 statistics over the Bank Holiday.