1 Victorian Infectious Diseases Reference Laboratory, The Peter Doherty Institute for Infection and Immunity, Royal Melbourne Hospital and University of Melbourne, Melbourne, VIC j.mcvernon@unimelb.edu.au.
2 Marie Bashir Institute for Infectious Diseases and Biosecurity, University of Sydney, Sydney, NSW.
3 Office of Health Protection, Australian Government Department of Health, Canberra, ACT.
4 The Peter Doherty Institute for Infection and Immunity, Royal Melbourne Hospital and University of Melbourne, Melbourne, VIC.