1. Nuffield Department of Clinical Laboratory Sciences, Oxford University, John Radcliffe Hospital, Oxford OX3 9DU, United Kingdom
2. Department of Medicine, New York University School of Medicine, 550 First Avenue, New York, New York 10016
3. Enteric Diseases Laboratory Branch, CDC, Atlanta, Georgia
4. Central Veterinary Institute of Wageningen UR, P.O. Box 65, 8200 AB Lelystad, Netherlands
5. WHO Collaborating Centre for Campylobacter and OIE-Reference Laboratory for Campylobacteriosis, Lelystad and Utrecht, Netherlands
6. Laboratory of Enteric Pathogens, Centre for Infections, Health Protection Agency, London, United Kingdom
7. Department of Infectious Diseases and Immunology, Faculty of Veterinary Medicine, Utrecht University, Utrecht, Netherlands