Joanna R Kirman1, Kylie M Quinn2,3, Robert A Seder4. 1. Department of Microbiology & Immunology, University of Otago, Dunedin, New Zealand. 2. RMIT University School of Biomedical and Health Sciences, Bundoora, VIC, Australia. 3. Monash University Biomedicine Discovery Institute, Clayton, VIC, Australia. 4. Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA.