1. Department of Wine, Food and Molecular Biosciences, Lincoln University, PO Box 85084, Lincoln, New Zealand
2. U.S. Department of Agriculture, Produce Safety and Microbiology Research Unit, Agricultural Research Service, Albany, CA, USA
3. Department of Veterinary Public Health, Faculty of Sciences, Ghent University, K. L. Ledeganckstraat 35, B-9000 Ghent, Belgium
4. Department of Biochemistry and Microbiology, Laboratory of Microbiology, Faculty of Sciences, Ghent University, K. L. Ledeganckstraat 35, B-9000 Ghent, Belgium
5. Department of Comparative Medicine, Massachusetts Institute of Technology, 77, Massachusetts Avenue, Cambiridge, MA 02139, USA