[1] Princess Alexandra Hosp, Infect Management Serv, Brisbane, Qld 4102, Australia
[2] Concord Hosp, Dept Microbiol & Infect Dis, Sydney, NSW, Australia
[3] Childrens Hosp Westmead, Dept Microbiol & Infect Dis, Sydney, NSW, Australia
[4] Royal Brisbane & Womens Hosp, Infect Dis Unit, Brisbane, Qld, Australia