Outbreaks caused by the vomiting and diarrhea-causing norovirus have surged in hospitals, schools and care homes, with the majority of cases in care home settings, the UK Health Security Agency (UKHSA) said.
The United Kingdom has reported a 66% spike in norovirus cases in England.
The UKHSA added that while elevated levels were expected in those aged 65 years and over, the number has not been seen in over a decade.
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"The number of people in hospitals with norovirus has risen significantly in line with what we are seeing in the community and in care homes," NHS Medical Director Professor Sir Stephen Powis said.
Powis added for the vast majority of people the infection will usually pass in a couple of days, and self-treating at home is the best way to avoid putting others at risk.