[1] Royal Melbourne Hosp, Victorian Infect Dis Serv, Parkville, Vic 3050, Australia
[2] Royal Melbourne Hosp, Dept Internal Med, Parkville, Vic 3050, Australia
[3] Royal Melbourne Hosp, Dept Urol, Parkville, Vic 3050, Australia
[4] Victorian Infect Dis Reference Lab, Melbourne, Vic, Australia