[1] Prince Wales Hosp, Dept Microbiol, Div Virol, SE Area Lab Serv, Randwick, NSW 2031, Australia
[2] Sydney Childrens Hosp, Dept Resp Med, Randwick, NSW, Australia
[3] Univ New S Wales, Sch Childrens & Womens Hlth, Randwick, NSW, Australia
[4] Univ New S Wales, Sch Med Sci, Fac Med, Kensington, NSW 2033, Australia
[5] Univ New S Wales, Sch Biotechnol & Biomol Sci, Fac Sci, Kensington, NSW 2033, Australia