1. Peter Doherty Institute for Infection and Immunity, Victorian Infectious Diseases Service, Royal Melbourne Hospital, Melbourne, Australia
2. Peter Doherty Institute for Infection and Immunity, Department of Infectious Diseases, University of Melbourne, Melbourne, Australia
3. Department of Intensive Care, Wesley Hospital, Brisbane, Australia
4. George Institute for Global Health, University of New South Wales, Sydney, Australia
5. Division of Infectious Diseases, Department of Medicine, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania