title: Reply to Petti.
authors: Hospital Epidemiology, University of North Carolina Health Care Division of Infectious Diseases, University of North Carolina School of Medicine, Chapel Hill.
authors: Hajime
authors: H
authors: Kanamori
authors: Hospital Epidemiology, University of North Carolina Health Care Division of Infectious Diseases, University of North Carolina School of Medicine, Chapel Hill.
authors: David J
authors: DJ
authors: Weber
authors: Hospital Epidemiology, University of North Carolina Health Care Division of Infectious Diseases, University of North Carolina School of Medicine, Chapel Hill.
authors: William A
authors: WA
authors: Rutala