Affiliations

• ¹ National Centre for Immunisation Research and Surveillance, The Children's Hospital at Westmead, Sydney, NSW, Australia; University of Sydney Children's Hospital Westmead Clinical School, NSW, Australia.
• ² Emergency Department, The Children's Hospital at Westmead, Sydney, NSW, Australia.
• ³ Monash University, Melbourne, VIC, Australia; Royal Melbourne Hospital, VIC, Australia.
• ⁴ University of Sydney Children's Hospital Westmead Clinical School, NSW, Australia; Department of Infectious Diseases and Microbiology, The Children's Hospital at Westmead, Sydney, NSW, Australia; philip.britton@health.nsw.gov.au.