1. Institute of Biotechnology, Vilnius University, V.A. Graiciuno 8, 02241 Vilnius, Lithuania
2. Institute of Microbiology and Virology, Veterinary Academy, Lithuanian University of Health Sciences, Tilzes 18, 47181 Kaunas, Lithuania
3. Institut für Virusdiagnostik, Friedrich-Loeffler-Institut, Suedufer 10, 17493 Greifswald-Insel Riems, Germany