Abstract
1Department of Clinical Microbiology, Statens Seruminstitut, Copenhagen, Denmark
2Enteric Diseases Branch, Hospital Infections Program, National Center for Infectious Diseases, Centers for Disease Control, Atlanta, Georgia 30333
3Meningitis and Special Pathogens Branch, Hospital Infections Program, National Center for Infectious Diseases, Centers for Disease Control, Atlanta, Georgia 30333
4Division of Bacterial and Mycotic Diseases, and Nosocomial Infections Laboratory Branch, Hospital Infections Program, National Center for Infectious Diseases, Centers for Disease Control, Atlanta, Georgia 30333