Abstract
1 Danish Veterinary Laboratory, DK-1790 Copenhagen V, Denmark
2 Department of Veterinary Microbiology, Royal Veterinary and Agricultural University, DK-1870 Frederiksberg C, Denmark
3 National Collection of Type Cultures, Central Public Health Laboratory, London NW9 5HT, United Kingdom
4 Laboratorium voor Microbiologic, University of Ghent, B-9000 Ghent, Belgium
5 Department of Medical Microbiology, University of Antwerp, B-2610 Antwerp, Belgium