1. Centre for Infectious Disease Control, Division Virology, National Institute for Public Health and the Environment, Bilthoven, the Netherlands
2. These authors contributed equally to this work
3. Department of Infectious Diseases and Immunology, Utrecht University, Faculty of Veterinary Medicine, Utrecht, the Netherlands
4. Laboratory of Experimental Virology, Department of Medical Microbiology, Center for Infection and Immunity Amsterdam, Academic Medical Center, University of Amsterdam, Amsterdam, the Netherlands
5. Institute of Virology, University of Bonn Medical Centre, Bonn, Germany
6. Department of Viroscience, Erasmus Medical Centre, Rotterdam, the Netherlands
7. Institute for Virology, University Hospital Essen, University of Duisburg-Essen, Essen, Germany