[1] Royal Childrens Hosp Melbourne, Infect Dis Unit, 50 Flemington Rd, Parkville, Vic 3052, Australia
[2] Univ Melbourne, Dept Paediat, Melbourne, Vic, Australia
[3] Murdoch Childrens Res Inst, Infect Dis Grp, Parkville, Vic, Australia
[4] Childrens Hosp, Infect Dis Unit, Westmead, NSW, Australia
[5] Univ Sydney, Sydney, NSW, Australia