1. Specialist Virology Centre, Royal Infirmary of Edinburgh, 51 Little France Crescent, Edinburgh EH16 4SA, United Kingdom
2. Centre for Infectious Diseases, University of Edinburgh, Summerhall, Edinburgh EH9 1QH, United Kingdom
3. Department of Medical Microbiology, Laboratory of Clinical Virology, Academic Medical Centre, Meibergdreef 15, 1105 AZ Amsterdam, The Netherlands