1. East of England Health Protection Team, Public Health England, Thetford, United Kingdom
2. National Infection Service, Public Health England, London, United Kingdom
3. Department of Microbiology, Cambridge University Hospitals NHS Foundation Trust, Cambridge, United Kingdom
4. PHE Public Health Laboratory Cambridge, Public Health England, Cambridge, United Kingdom.
5. Granta Medical Practices, Cambridge, United Kingdom
6. NIHR Health Protection Research Unit in Respiratory Infections, Public Health England, London, United Kingdom
7. Field Epidemiology Service, Public Health England, Cambridge, United Kingdom
8. Department of Medicine, University of Cambridge School of Clinical Medicine, University of Cambridge Hospitals Trust, Cambridge, United Kingdom
9. Immunisation, Hepatitis and Blood Safety Department, National Infection Service, Public Health England, London, United Kingdom