Affiliation: | From the ‡Department of Infectious Diseases and Immunology, Utrecht University, P. O. Box 80.165, 3508 TD Utrecht, The Netherlands and ;the §WHO Collaborating Centre for Campylobacter/OIE Reference Laboratory for Campylobacteriosis Utrecht/Lelystad, P.O. Box 65, 8200 AB Lelystad, The Netherlands Lelystad, The Netherlands |