1. Northern Ireland Public Health Laboratory, Department of Bacteriology, Belfast City Hospital, Belfast, BT9 7AD;
2. School of Biomedical Sciences, University of Ulster, Cromore Road, Coleraine
3. Northern Ireland Regional Adult Cystic Fibrosis Centre, Level 8, Belfast City Hospital, Lisburn Road, Ireland
4. Department of Respiratory Medicine, The Queen’s University of Belfast, Belfast City Hospital, Belfast, Northern Ireland
5. Department of Microbiology, The Adelaide & Meath Hospital, Belfast City Hospital, Tallaght, Dublin 24, Ireland