HEALTH chiefs have said three wards remain closed to general visitors following an outbreak of diarrhoea and vomiting.
The clinical decision unit (CDU) at Morriston Hospital and wards 5 and 6 at the Princess of Wales Hospital in Bridgend have been affected.
All remain open for patients, according to Abertawe Bro Morgannwg University Health Board.
But anyone with recent sickness or flu symptoms is being urged to stay away.
The on-going situation has sparked a repeated warning to people to take care not to spread infection.
The elderly, the very young, and those with chronic illnesses are particularly at risk from the bugs, according to Dr Push Mangat, interim medical director and consultant in intensive care medicine and anaesthesia.
"We currently have two wards closed at the Princess of Wales Hospital because of sickness and diarrhoea,” he said.
"Not only is this awful for the patients who are already poorly, but it means they can't have visitors and we have to restrict the use of the wards.
"This reduces our ability to admit other patients to our hospitals - e.g. from the emergency department."
People who were unwell should stay at home for 48 hours after their last incidence of sickness or diarrhoea, and not have visitors, according to Dr Mangat.
"You must keep contact with others to a minimum and most of all please do not visit hospitals or those who are vulnerable such as the elderly, the very young and those with chronic illnesses," he added.