1. National Institute of Public Health, Šrobárova 48, 100 42 Prague, Czech Republic
2. Department of Infectious Diseases, Leiden University Medical Center C5-P, P.O. Box 9600, 2300 RC Leiden, The Netherlands
3. BCCM/LMG Bacteria Collection, University of Ghent, K. L. Ledeganckstraat 35, B-9000 Gent, Belgium
4. Department of Clinical Chemistry, Microbiology and Immunology, University Hospital, Blok A, B-9000 Gent, Belgium
5. Department of Clinical Microbiology, U nemocnice 85, Příbram, Czech Republic