1. Field Epidemiology Training Fellow, UK Field Epidemiology Training Programme, Public Health England, UK
2. Field Epidemiology Service, National Infection Service, Public Health England, Birmingham, UK
3. Consultant Epidemiologist (locum), Field Epidemiology Service, National Infection Service, Public Health England, Birmingham, UK
4. Division of Health Sciences, Warwick Medical School, The University of Warwick, Coventry, UK
5. Health Protection Nurse, Public Health England, West Midlands, Health Protection Team, Stafford, UK
6. Head of E. coli, Shigella, Yersinia and Vibrio Reference Service, National Infection Service, Gastrointestinal Bacteria Reference Unit, Public Health England, London, UK
7. Consultant Epidemiologist, Field Epidemiology Service, National Infection Service, Public Health England, Birmingham, UK
8. Consultant in Communicable Disease Control, Public Health England, West Midlands, Health Protection Team, Stafford, UK