1. Virology Research Laboratory Prince of Wales Hospital Sydney New South Wales Australia
2. School of Medical Sciences, Faculty of Medicine University of New South Wales Sydney New South Wales Australia
3. Department of Medicine University of Otago Wellington New Zealand
4. Department of Public Health University of Otago Wellington New Zealand
5. Serology and Virology Division, South Eastern Area Laboratory Services Microbiology Prince of Wales Hospital Sydney Australia
6. School of Women’s and Children’s Health, Faculty of Medicine University of New South Wales Sydney Australia