aDepartment of General Paediatrics, Perth Children's Hospital, Hospital Avenue

bWesfarmers Centre of Vaccines and Infectious Diseases, Telethon Kids Institute, University of Western Australia

cSchool of Population Health, Curtin University

dDepartment of Infectious Diseases, Perth Children's Hospital, Hospital Avenue

eSchool of Medicine, University of Western Australia

fDepartment of Microbiology, PathWest Laboratory Medicine, QEII Medical Centre, Perth, Western Australia

Correspondence to Prof. Christopher C. Blyth, c/o Perth Children's Hospital, Hospital Avenue, Nedlands, Perth 6009, WA, Australia. Tel: +61 6457 3333; e-mail: [email protected]