In a statement, ITH Pharma managing director Karen Hamling said:
ITH Pharma is very saddened to hear about the death of a baby in hospital, and that 14 others are ill with septicaemia.
ITH Pharma is a specialist manufacturer of parenteral nutrition, which is given to babies in neo-natal intensive care units.
The products in question, which are no longer in circulation, are made to order for individual patients on a daily basis, in response to bespoke orders from hospitals.
We are co-operating fully with the MHRA in the investigation, and are doing everything we can to help them establish the facts in this case as quickly as possible.
Questions have been raised over how a batch of intravenous fluid could potentially have become contaminated, after the death of one baby.
The suspected contaminated batch of a food supplement linked to the blood poisoning of 17 babies, was sent to 22 hospitals.