Cavan, Monaghan and Donegal are now under level 4 restrictions, meaning shops that sell non-essential items are not allowed to open for four weeks.
In addition, no more than six people from two households can meet outdoors.
It comes as a record 1,205 cases including 173 in Cork were confirmed last night.
Chief Medical Officer Dr. Tony Holohan says they working on additional guidance for people who live alone.
