1. a Ceva-Phylaxia RT , Szállás u. 5., Budapest, H-1107, Hungary
2. b Central Veterinary Institute , Tábornok u. 2., Budapest, H-1149, Hungary
3. c Department of Pathology and Veterinary Forensic Medicine, Faculty of Veterinary Science , Szent István University , István út 2., Budapest, H-1078, Hungary
4. d Regional Laboratory of Virology , Baranya County Institute, State Public Health Service , Szabadság u. 7., Pécs, H-7623, Hungary
5. e Veterinary Medical Research Institute , Hungarian Academy of Sciences , Hungária krt. 21., Budapest, H-1143, Hungary