1. Gastrointestinal, Emerging and Zoonotic Infections Department, Public Health England, London, United Kingdom
2. Gastrointestinal Bacteria Reference Unit, Public Health England, London, United Kingdom
3. Incidents Branch, Food Standards Agency, London, United Kingdom
4. Gastrointestinal and Zoonoses team, Health Protection Scotland, Glasgow, United Kingdom
5. Health Protection Division, Public Health Wales, Cardiff, United Kingdom