It said it had taken the precaution of closing down its systems to further protect them, and to allow it to assess the situation.
Irish broadcaster RTÉ said Dublin's Rotunda Hospital has cancelled most outpatients visits on Friday.
All gynaecology clinics are cancelled.
However, it said those with any urgent concerns should attend as normal.
The maternity hospital says all outpatient visits are cancelled, unless expectant mothers are at 36 weeks pregnant or later.
