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[Immunological and functional characteristics of epitopes and regions of gB glycoprotein of Aujeszky's disease virus].

The role of different gB epitopes and regions at some stages of virus replication in cell cultures and in the formation of immunity to Aujeszky's disease virus (ADV) was studied using a panel of 13 monoclonal antibodies (MAB) that recognize glycoprotein gB (gB) of ADV and antisera against fusion recombinant proteins expressing gB fragments. Productive infection following virion attachment was prevented by antibodies to the N-terminal domain of gB. Three MABs against the N-terminal domain of gB and 5 MABs directed against the immunodominant region located in the gBc-subunit of gB inhibited the cell-to-cell spread of viral infection. After immunization with recombinant proteins expressing the N-terminal fragments of gB 80% mice were protected from lethal ADV challenge. After passive immunization the majority of MABs protected 20-80% mice from lethal ADV challenge. Hence, the N-terminal domain of ADV gB is associated with the virus penetration into the cell and is important for anti-ADV immunity.