Children’s Hospital at Westmead - The National Centre for Immunisation Research and Surveillance (NCIRS), National Centre for Immunisation Research and Surveillance, National Centre for Immunisation Research and Surveillance, Macquarie University, The University of Sydney, The University of Sydney - Westmead Hospital, The University of Sydney - Sydney Infectious Diseases Institute, National Centre for Immunisation Research and Surveillance, Australian Red Cross, Westmead Hospital - Centre for Infectious Diseases and Microbiology Laboratory Services, NSW Health Pathology-Institute of Clinical Pathology and Medical Research, Australian Red Cross, National Centre for Immunisation Research and Surveillance, National Centre for Immunisation Research and Surveillance, Charles Darwin University - Menzies School of Health Research, The University of Sydney - Westmead Hospital, Australian Red Cross and Children’s Hospital at Westmead - The National Centre for Immunisation Research and Surveillance (NCIRS)

Children’s Hospital at Westmead - The National Centre for Immunisation Research and Surveillance (NCIRS), National Centre for Immunisation Research and Surveillance, Children’s Hospital at Westmead - The National Centre for Immunisation Research and Surveillance (NCIRS), Children’s Hospital at Westmead - The National Centre for Immunisation Research and Surveillance (NCIRS), The University of Western Australia, Sydney Children's Hospital - Department of Immunology and Infectious Diseases, University of Melbourne - Infection and Immunity, University of Adelaide - Vaccinology and Immunology Research Trials Unit, Royal Darwin Hospital, affiliation not provided to SSRN, affiliation not provided to SSRN, Children’s Hospital at Westmead - The National Centre for Immunisation Research and Surveillance (NCIRS) and Children’s Hospital at Westmead - The National Centre for Immunisation Research and Surveillance (NCIRS)The University of Sydney, School of Public Health