1. Authors contributed equally
2. Department of Virology, University of Helsinki, Helsinki, Finland
3. Department of Veterinary Biosciences, University of Helsinki, Helsinki, Finland
4. Division of Clinical Microbiology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
5. University of Rostock, Rostock, Germany
6. Departments of Virology and Arbovirology, Bernhard Nocht Institute for Tropical Medicine, Hamburg, Germany
7. German Centre for Infection Research (DZIF), Hamburg, Germany
8. Institute of Veterinary Pathology, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland