1 Infection Control Program and WHO Collaborating Centre on Patient Safety, The University of Geneva Hospitals and Faculty of Medicine, Geneva, Switzerland.
2 Intermountain LDS Hospital, Intermountain Healthcare, Salt Lake City, UT, USA.
3 Infectious Diseases Division and National Reference Centers for Influenza and Emerging Viruses, The University of Geneva Hospitals and Faculty of Medicine, Geneva, Switzerland.
4 Infection Control Program and WHO Collaborating Centre on Patient Safety, The University of Geneva Hospitals and Faculty of Medicine, Geneva, Switzerland. Electronic address: Didier.pittet@hcuge.ch.