1. Department of Infectious Diseases and Immunology, Faculty of Veterinary Medicine, Utrecht University, Utrecht, The Netherlands
2. Produce Safety and Microbiology Research Unit, Agricultural Research Service, U.S. Department of Agriculture, Albany, California, USA
3. Department of Medicine, New York University School of Medicine, New York, New York, USA
4. Central Veterinary Institute of Wageningen UR, Lelystad, The Netherlands
5. WHO Collaborating Center for Campylobacter/OIE Reference Laboratory for Campylobacteriosis, Lelystad, The Netherlands