1. School of Veterinary and Biomedical Sciences, Murdoch University, Murdoch, Western Australia 6150, Australia
2. Perth Zoo, 20 Labouchere Road, South Perth, Western Australia 6951, Australia
3. Laboratory of Clinical and Epidemiological Virology, Department of Microbiology and Immunology, Rega Institute for Medical Research, University of Leuven, Minderbroedersstraat 10, B-3000 Leuven, Belgium
4. Science Division, Department of Environment and Conservation, Brain Street, Manjimup, Western Australia 6258, Australia