Abstract
*Royal Liverpool University Hospital, Department of Medical Microbiology, Prescot Street, Liverpool L7 8XP
‡Public Health Laboratory, General Hospital, Westgate Road, Newcastle upon Tyne NE4 6BE
‡Respiratory Unit, Royal Liverpool Childrens Hospital, Alder Hey, Eaton Road, Liverpool L12 2AP
Department of Medical Microbiology, Medical School, University of Newcastle, Newcastle upon Tyne NE2 4HH
||Department of Bacteriology, Royal Liverpool Childrens Hospital, Alder Hey, Liverpool L12 2AP