A fresh 'stay at home' alert has been issued by the UK Health Security Agency ( UKHSA ) as people with six symptoms are being reminded to avoid leaving the house while ill. The alert was put out this morning (February 3) on social media. It comes as the latest figures show there are active cases of norovirus in the UK, and they are increasing as of late January 2026. The activity is especially high for this time of year. Norovirus laboratory reports for the two-week period of January 12-25,