1. Institut für Hygiene und Mikrobiologie der Universität Würzburg, 97080 Würzburg,1 and
2. Institute for Medical Microbiology, Charles University, Prague, 150 06 Prague, Czech Republic2; and
3. Robert Koch Institut, Bereich Wernigerode, 38855 Wernigerode,3 Germany;
4. Department of Pediatrics, Wake Forest University School of Medicine, Winston-Salem, North Carolina 27157-10814