1 Disease Elimination Program, Burnet Institute, Melbourne, VIC 3004, Australia; Department of Infectious Diseases, Barwon Health, Geelong, VIC, Australia. Electronic address: amanda.wade@burnet.edu.au.
2 Disease Elimination Program, Burnet Institute, Melbourne, VIC 3004, Australia; Department of Infectious Diseases, Alfred Health and Monash University, Melbourne, VIC, Australia.