[1] Univ Szeged, Albert Szent Gyorgy Med Sch, Dept Med Biol, Som u 4, H-6720 Szeged, Hungary
[2] Univ Pecs, Szentagotha Res Ctr, Natl Lab Virol, Pecs, Hungary
[3] Univ Pecs, Inst Biol, Fac Sci, Pecs, Hungary
[4] Vet Res Inst, Hudcova 70, Brno 62100, Czech Republic
[5] Czech Acad Sci, Biol Ctr, Inst Parasitol, Branisovska 31, Ceske Budejovice 37005, Czech Republic
[6] Masaryk Univ, Fac Sci, Dept Expt Biol, Kamenice 753-5, Brno 62500, Czech Republic
[7] Univ Vet Med Budapest, Dept Microbiol & Infect Dis, Hungaria krt 23-25, H-1143 Budapest, Hungary