1. Institute for Veterinary Medical Research, Centre for Agricultural Research, Hungarian Academy of Sciences, Budapest, Hungary
2. Department of Virology, Haartman Institute, Faculty of Medicine, University of Helsinki, Helsinki, Finland
3. János Szentágothai Research Center, University of Pécs, Pécs, Hungary
4. Institute of Biology, Faculty of Sciences, University of Pécs, Pécs, Hungary
5. Department of Virology and Immunology, HUSLAB, Hospital District of Helsinki and Uusimaa, Helsinki, Finland
6. Department of Veterinary Biosciences, Faculty of Veterinary Medicine, University of Helsinki, Helsinki, Finland