Two wards have been closed to visitors at Swansea Morriston Hospital due to an outbreak of a sickness bug.
Health officials say Ward S and Cyril Evans Ward have been closed due to the norovirus.
Officials usually urge people not to visit if they have had diarrhoea or vomiting symptoms in the past 48 hours.
Abertawe Bro Morgannwg University Health Board is monitoring the situation.
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