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), Children’s Hospital at Westmead - The National Centre for Immunisation Research and Surveillance (NCIRS), Monash University - Department of Infectious Diseases, University of Adelaide - Vaccinology and Immunology Research Trials Unit, Perth Children's Hospital - Department of Infectious Diseases, Charles Darwin University - Menzies School of Health Research, Children’s Hospital at Westmead - The National Centre for Immunisation Research and Surveillance (NCIRS) and University of Melbourne - Murdoch Children's Research Institute