Two hospital wards have been closed after a sudden outbreak of multiple cases of coronavirus.
Urgent and "robust action" has been taken at the the Royal Glamorgan Hospital in Wales where 34 people have come down with the deadly bug.
Wards have been immediately closed with a risk-assessment of all affected wards and at-risk wards underway.
A spokesperson for Cwm Taf Morgannwg University Health Board said it appeared the outbreak was "mainly" sparked by virus transmission within the hospital.
Dr Kelechi Nnoaham, director of public health for Cwm Taf Morgannwg University Health Board, said: "The health and wellbeing of our patients and staff is our number one priority and we take infection prevention and control measures extremely seriously.
"I would like to reassure the public that immediate action has been taken to address this outbreak, and although it is too early to confirm the end of the outbreak, early evidence suggests that this has resulted in the number of infections transmitted within the hospital being contained.
"Cases of Covid-19 have been steadily rising across our communities and it is vital is that we all play our part in helping to reduce the spread of the virus through social distancing, good hand hygiene, the wearing of masks and PPE in appropriate settings and following the latest government measures on further restrictions."
Infection prevention and control measures at the hospitals are being reviewed in the light of this outbreak, while testing of healthcare staff is being increased and targeted.
All emergency and elective hospital admissions are being tested.
Meanwhile, social visiting is now being limited in the health board's hospitals.
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