University of Melbourne - Peter Doherty Institute for Infection and Immunity, University of Otago - Department of Public Health, University of Melbourne - Peter Doherty Institute for Infection and Immunity, University of Melbourne - School of Mathematics and Statistics, University of Auckland - Department of Molecular Medicine and Pathology, University of Melbourne - Department of Microbiology and Immunology, University of Otago - University of Otago Wellington, University of Auckland - Te Kupenga Hauora Māori (TKHM), University of Auckland - Department of General Practice, University of Melbourne - Department of Infectious Diseases, University of Otago - Department of Public Health, University of Melbourne - Victorian Infectious Disease Reference Laboratory and University of Auckland - Faculty of Medical and Health Sciences