1. Laboratory of Microbiology, Ghent University, K. L. Ledeganckstr. 35, B-9000 Ghent, Belgium
2. Microbial Diseases Laboratory, Division of Communicable Disease Control, California Department of Health Services, Berkeley, CA 94704-1011, USA
3. Laboratory of BCCMTM/LMG Bacteria Collection, Ghent University, K. L. Ledeganckstr. 35, B-9000 Ghent, Belgium