[1] St George Hosp, Dept Microbiol, New South Wales Hlth Pathol, Kogarah, NSW, Australia
[2] Univ New South Wales, St George & Sutherland Clin Sch, Sydney, NSW, Australia
[3] Westmead Hosp, Inst Clin Pathol & Med Res, Ctr Infect Dis & Microbiol Lab Serv, New South Wales Hlth Pathol, Westmead, NSW, Australia
[4] Westmead Hosp, Inst Clin Pathol & Med Res, Ctr Infect Dis & Microbiol Publ Hlth, New South Wales Hlth Pathol, Westmead, NSW, Australia
[5] South Western Sydney Local Hlth Dist, Publ Hlth Unit, Camperdown, NSW, Australia
[6] Univ Sydney, Fac Med & Hlth, Sydney, NSW, Australia