[1] Hungarian Acad Sci, Vet Med Res Inst, H-1581 Budapest, Hungary
[2] Inst Vet Med Prod, H-1107 Budapest, Hungary
[3] Szent lstvan Univ, Fac Vet Sci, Dept Microbiol & Infect Dis, H-1581 Budapest, Hungary
[4] Fed Res Inst Anim Hlth, Friedrich Loeffler Inst, Inst Bacterial Infect & Zoonoses, Jena, Germany
[5] Cent Agr Off Vet Diagnost Directorate, H-1143 Budapest, Hungary