Chiefs at Lynn’s Queen Elizabeth Hospital is asking for visitors who have suffered diarrhoea and vomiting to stay away.
The hospital is also asking visitors not to bring in food from home to patients.
Dr Ian Hosein, interim associate medical director for infection prevention and control, said: “The most common way Norovirus and similar germs are spread is through ingestion.
“We can eliminate them to the best we possibly can within the hospital but they will keep returning if visitors carry them in.”
“I would ask visitors not to bring self-prepared food items into hospital as these items could be contaminated and put patients at risk of getting Norovirus infection.
“This may then result in ward closures which puts the hospital under pressure.”
Visitors who have had diarrhoea and vomiting in the past 48 hours are reminded not to visit the hospital