1. Virology and Pathogenesis, Microbiology Services, Health Protection Agency, Porton Down, Wiltshire, United Kingdom
2. Department of Clinical Infection, Microbiology and Immunology, Institute of Infection and Global Health, University of Liverpool, Liverpool, United Kingdom
3. Rare and Imported Pathogens Department, Microbiology Services, Health Protection Agency, Porton Down, Wiltshire, United Kingdom
4. Biological Investigations Group, Microbiology Services, Health Protection Agency, Porton Down, Wiltshire, United Kingdom
5. Animal Health and Veterinary Laboratories Agency, Thirsk, Yorkshire, United Kingdom
6. Animal Health and Veterinary Laboratories Agency, Luddington, Warwickshire, United Kingdom
7. Thames Valley Health Protection Unit, Centre for Radiation, Chemical & Environmental Hazards, Health Protection Agency, Oxfordshire, United Kingdom
8. Public Health Wales, Health Protection Team, Flintshire, United Kingdom
9. Gastrointestinal, Emerging and Zoonotic Infections Department, Health Protection Services, Health Protection Agency Colindale, London, United Kingdom