The Mater Hospital in Dublin is urging the public to stay away from its emergency department due to high numbers and long waiting times.
In a statement this lunchtime it has said - where possible - people should attend their GP first - or the Rapid Injury Clinic in Smithfield for minor injuries.
The hospital is currently experiencing very high numbers and protracted waiting times in the ED.
Those attending will be managed according to priority.
Meanwhile, the CEO of the Dublin Midlands Hospital Group, Doctor Susan O’Reilly, has said efforts are being made to address the issue.
“This is the time of year where you certainly do see infectious diseases, we always anticipate a surge right now, we are all doing our utmost to address it,
“Certainly meeting weekly with the nurse’s union, to ensure we are monitoring very carefully how best we implement the full escalation protocol that we have in place in order to patients get admitted as promptly as possible.”