Hamsters were immunized with either an affinity-purified preparation of equid herpesvirus 1 (EHV-1) glycoprotein 13 (gp13) or synthetic peptides representing three sequences within the homologous glycoprotein of EHV-4, resulting in the production of anti-peptide (in the case of peptide-immunized animals) or antivirus antibodies. The sera from gp13-immunized hamsters contained antibodies which showed virus-neutralizing activity and complement-mediated antibody lysis of EHV-1-infected target cells. These hamsters were protected from EHV-1 challenge. The characteristics of a panel of anti-gp13 monoclonal antibodies (P28, P17, 14H7, 16E4 and 16H9) were assessed both and . 16E4 and P28 showed high levels of complement-mediated neutralization of virus, complement-mediated lysis of virus-infected target cells and passive protection of hamsters. Furthermore, epitope mapping studies demonstrated that this glycoprotein contains a neutralizing epitope recognized by EHV-1-immune horse serum. The data imply that gp13 has potential as a candidate antigen for a molecular vaccine.


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