1 Division of Pediatric Infectious Diseases, Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, MD, USA. eprocha1@jhmi.edu.
2 Department of Hospital Epidemiology and Infection Control, Johns Hopkins Health System, Baltimore, MD, USA. eprocha1@jhmi.edu.
3 Division of Pediatric Infectious Diseases, Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, MD, USA.
4 Department of Hospital Epidemiology and Infection Control, Johns Hopkins Health System, Baltimore, MD, USA.