Published Sunday, 29 January 2012
The infection claimed the lives of three babies at the Royal Jubilee Maternity hospital in January, and one baby at Altnagelvin Hospital in December.
Babies in the Ulster Hospital's intensive care unit were tested for Pseudomonas and results show none of them have the active infection.
Director of Nursing, Charlotte McArdle told UTV: "We've found some presence of Pseudomonas in a small number of water outlets within in the neonatal unit, but there's no contact between that water supply and the babies.
"We are fully on top of this outbreak."
Any water that comes into contact with the babies is sterile and "stringent infection control measures" are being carried out.
All staff and parents who come into the unit are washing their hands and then using gel which eradicates the infection.
"We've replaced one of those taps with a new tap and there's a programme of ongoing tap replacement over the next few days within the unit," said Ms McArdle.
She also confirmed there is no risk to babies who have already been discharged from the unit.