Managers at Lynn’s Queen Elizabeth Hospital have appealed for help from the public to combat a spike in norovirus cases at the Gayton Road site.
Trust officials say they have had a surge of admissions of patients with symptoms of the bug in recent days.
And they have asked for anyone who has experienced symptoms of vomiting or diarrhoea within the last 72 hours to stay away from the hospital altogether.
Dr Ian Hosein, the hospital’s associate medical director for infection prevention and control, added: “It’s important to let people know that Norovirus is principally a food borne infection.
“I would ask visitors to please not bring self-prepared food items into our hospital.
“They could be accidentally contaminated with the virus, which puts patients at risk of getting the infection,
“Looking after patients with Norovirus means we sometimes have to close areas to stop the virus spreading, which naturally puts the hospital under further pressure.
“Any support you can give in preventing more cases by washing your hands properly, not bringing food into hospital and not visiting if you’ve been poorly in the previous 72 hours will be a significant help.”