Traces of pseudomonas were found in water dispensers at the South West Acute Hospital in Enniskillen. Those with weak immune systems are particularly vulnerable to infection - babies, sick and elderly need to be extra careful.
Pseudomonas infections had caused the death of four babies last year. Nearly 70 water dispensers at the hospital have been out of use in the hospital after traces of pseudomonas were discovered.
A spokesman for the Western Trust said, "As a precautionary measure all water dispensers have been temporarily taken out of use for further review. These water dispensers will not be put back in use until a full review is complete. The public can be assured that this is not an issue with the water quality of the main water supply at the hospital but is an isolated issue with the water dispensers themselves and has had no impact on patient care. The hospital has a portable water supply which means all tap water is drinkable and adequate water jugs and disposable cups are available in all departments for use by staff, patients and visitors."