1. Group A Streptococcus Research Group, Murdoch Childrens Research Institute, Melbourne, VIC 3052, Australia
2. Centre for International Child Health, University of Melbourne, Melbourne, VIC 3052, Australia
3. Pneumococcal Research Group, Murdoch Childrens Research Institute, Melbourne, VIC 3052, Australia
4. Department of Paediatrics, Royal Children’s Hospital, Melbourne, VIC 3052, Australia