1. Public Health Unit, Sydney South West Area Health Service, Sydney, NSW.
2. School of Public Health, University of Sydney, Sydney, NSW.
3. Department of Microbiology, Sydney South West Pathology Service — Royal Prince Alfred Hospital, Sydney, NSW.
4. Microbiology and Infectious Diseases Unit, School of Medicine, University of Western Sydney, Sydney, NSW.
5. Department of Microbiology and Infectious Diseases, Sydney South West Pathology Service — Liverpool Hospital, Sydney, NSW.