1. Department of Infectious Diseases and Microbiology, Royal Prince Alfred Hospital , Sydney, New South Wales , Australia
2. Kirby Institute, University of New South Wales , Sydney, New South Wales , Australia
3. Department of Neuropathology, Royal Prince Alfred Hospital , Sydney, New South Wales , Australia
4. School of Medical Sciences, University of Sydney , Sydney, New South Wales , Australia
5. Serology and Virology Division, Department of Microbiology, New South Wales Health Pathology , Sydney, New South Wales , Australia
6. School of Clinical Medicine, Faculty of Medicine and Health, University of New South Wales , Sydney, New South Wales , Australia
7. Department of Clinical Immunology and Allergy, Royal Prince Alfred Hospital , Sydney, New South Wales , Australia