A ward at West Suffolk Hospital has been closed to new admissions after patients showed symptoms of norovirus.
Ward F10 was closed to new admissions on Saturday after seven patients contracted the highly contagious diarrhoea and vomiting virus.
Visitors to Bury St Edmunds hospital have been urged to take extra care to wash their hands with soap and water both on arrival and when leaving the ward as the alcohol gel is not effective against the virus.
Anyone who has shown symptoms of the virus has been asked to stay away.
Nichole Day, executive chief nurse at the hospital, said: “Norovirus is very infectious and every year there are cases in the community which transfer to the hospital.
“Because the virus has an incubation period of a few days, people are often unaware that they are carrying it until after they have passed it on.
“We would advise anyone who has had diarrhoea or vomiting to stay away from the hospital for at least 72 hours after they have recovered, even if they feel better.
“Otherwise they run the risk of unknowingly passing the highly contagious illness on to someone who is already sick.”