[1] Hungarian Acad Sci, Vet Med Res Inst, H-1143 Budapest, Hungary
[2] Univ Pecs, Dept Med Microbiol & Immunol, H-7624 Pecs, Hungary
[3] Univ Bari, Dept Anim Hlth & Wellbeing, I-70010 Bari, Italy
[4] Szent Istvan & Szent Laszlo Hosp, Lab Diagnost Virol, H-1097 Budapest, Hungary
[5] Univ Leuven, Dept Microbiol & Immunol, Rega Inst Med Res, B-3000 Louvain, Belgium