1. Perth Children’s Hospital, 15 Hospital Avenue, Perth, Western Australia, Australia
2. Wesfarmers Centre for Vaccines and Infectious Diseases, Telethon Kids Institute, Perth, Western Australia, Australia
3. School of Medicine, Division of Paediatrics, University of Western Australia, Perth, Western Australia, Australia
4. Centre for Infectious Diseases and Microbiology, Westmead Hospital, University of Sydney, and Department of Infectious Diseases, Blacktown Hospital, Sydney, New South Wales, Australia
5. Global and Tropical Health Division, Menzies School of Health Research, Darwin, Northern Territory, Australia
6. Department of Infectious Diseases, John Hunter Hospital, Newcastle, New South Wales, Australia
7. Victorian Infectious Disease Service, The Royal Melbourne Hospital, and The University of Melbourne, at the Peter Doherty Institute for Infection and Immunity, Victoria, Australia