St Patrick's Hospital, Waterford has reopened for restricted visiting following its closure last week over an outbreak of the winter vomiting virus.
A total of 11 patients and 12 members of staff at are now thought to have contracted.
A limit of one visitor per patient at a time has now been imposed.
The South Eastern Health Board has requested the public not to visit the hospital if they have themselves experienced recent diarrhoea, vomiting or cramps.
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It has also asked visitors to respect the advice and direction of staff members in a bid to curb the spread of the virus.