The UK could face a second norovirus wave, according to health officials, who warned that people who have recently had the illness may be at risk again.
On Thursday, the UK Health Security Agency (UKHSA) warned laboratory reports of the virus, which can cause nausea, vomiting and diarrhoea, are at their highest-ever levels.
There are an “exceptionally high” number of cases at the moment, said Amy Douglas, lead epidemiologist at UKHSA.
New NHS figures also show the number of beds taken up by patients with the virus is nearly 150% higher than last year.
Health officials believe a certain norovirus strain could be driving up cases as people who have been previously infected may not have immunity.
That also means that people who have recently been ill with norovirus are at risk of catching it again.
The less common strain now represents 29% of cases compared to just 10% three months ago.
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Several UK studies have found that norovirus is the most common cause of gastrointestinal illness, where a cause is identified.
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“We are seeing the biggest impacts in health and social care settings, such as hospitals and care homes,” said Ms Douglas.
“Symptoms of norovirus can be more severe in older adults, young children and those who are immunocompromised.
“If you have diarrhoea and vomiting, please do not visit hospitals and care homes or return to work, school or nursery until 48 hours after your symptoms have stopped and don’t prepare food for others, as you can still pass on the virus during this time.”
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Norovirus is highly contagious and isn’t killed by alcohol gel or wipes.
To avoid spreading the virus, people should wash their hands with soapy water and use bleach to clean surfaces, according to Ms Douglas.
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“These statistics show that we are still not out of the winter woods,” said health secretary Wes Streeting.
Professor Sir Stephen Powis, NHS England’s national medical director, warned that “we can be under no illusions about the continued pressure staff are still facing”.