A super-spreading event has been blamed for the deaths of eight patients with coronavirus at one hospital.
The people have all lost their lives at the Royal Glamorgan Hospital in Llantrisant.
Six more people are currently in intensive care.
The recent outbreak has seen 82 people infected at the Llantrisant hospital and has led to the health board has deciding to cut services and put measures in place to contain the spread of the virus.
Things have escalated quickly over the weekend at the South Wales hospital.
The current outbreak is likely to have been caused by a “super spreading” event, said the Cwm Taf University Health Board Executive Director of Public Health Kelechi Nnoaham.
He said: “It is very difficult to give 100% assurance that we first of all have a perfect understanding of how this has come about and that whatever interventions we put in place will work.”
The influx of coronavirus patients has led the Royal Glamorgan Hospital to take drastic measures.
As of today patients who would usually be taken to A&E at the hospital in an emergency will also be sent elsewhere as part of the plan.
Planned surgeries have also been temporarily suspended.
The measures came into force at 2pm.
The latest cases and deaths figures show Rhondda Cynon Taf, which the Royal Glamorgan Hospital serves, has the third-highest level of Covid cases in Wales.
A statement from Cwm Taf Morgannwg University Health Board said: “Significant temporary service restrictions will be put in place at Royal Glamorgan Hospital from 14.00 Wednesday September 30 as increased action is taken to contain a COVID-19 outbreak within the hospital.
“Teams have been working at pace to implement robust measures to manage the outbreak, however additional cases linked to transmission within the hospital have been confirmed in recent days with the number of cases currently standing at 82.
“Given the extent of this outbreak, and on advice of Public Health Wales, the Health Board is taking a number of urgent and significant actions to ensure the safety of our staff, patients and communities.”
In a bid to offer care to the Covid-19 patients, all planned surgeries except for urgent cancer cases will be stopped.