1. Department of Microbiology, PathWest Laboratory Medicine WA, QEII Medical Centre, Nedlands, WA 6009
2. Faculty of Health Sciences, Curtin University, GPO Box U1987, Perth, WA 6845
3. Public and Aboriginal Health Division, Department of Health, Grace Vaughan House, Shenton Park, Western Australia, WA 6008
4. Faculty of Medicine and Health Sciences, University of Western Australia, Nedlands, WA 6009, Australia