1. Clinical Microbiology and Public Health Laboratory, Public Health England, Cambridge, UK
2. Department of Medicine, University of Cambridge, Cambridge, UK
3. The John Farman Intensive Care Unit, Addenbrookes Hospital, Cambridge University Hospitals NHS Foundation Trust, Cambridge, UK
4. NHS GGC, Glasgow Royal Infirmary, Department of Clinical Microbiology, New Lister Building, Alexandra Parade, Glasgow, UK