1. Laboratory of Microbiology, Universiteit Gent, K. L. Ledeganckstraat 35, B-9000 Ghent Belgium
2. National Collection of Type Cultures, Central Public Health Laboratory, London NW9 5HT, UK
3. Department of Medical Microbiology, University of Edinburgh, Edinburgh, UK
4. Department of Medical Microbiology, University Hospital UIA, Antwerp, Belgium