1. Laboratory of Veterinary Bacteriology and Mycology, Ghent University, Salisburylaan 133, B-9820 Merelbeke, Belgium
2. BCCM/LMG Bacteria Collection, Laboratory of Microbiology, Faculty of Sciences, Ghent University, Ledeganckstraat 35, B-9000 Ghent, Belgium
3. School of Food Biosciences, University of Reading, Reading RG6 6AP, UK