[1] Univ Sydney, Sydney Med Sch, Sydney, NSW, Australia
[2] Childrens Hosp Westmead, Dept Gen Med, Locked Bag 4001, Westmead, NSW 2145, Australia
[3] Childrens Hosp Westmead, Dept Infect Dis, Westmead, NSW, Australia
[4] Kids Res, Natl Ctr Immunisat Res & Surveillance, Sydney, NSW, Australia
[5] Kids Res, Australian Paediat Surveillance Unit, Sydney, NSW, Australia
[6] Peter Doherty Inst Infect & Immun, Natl Enterovirus Reference Lab, Melbourne, Vic, Australia
[7] Univ Otago, Dept Womens & Childrens Hlth, Dunedin, New Zealand