Bovine respiratory syncytial virus-specific monoclonal antibodies.

Five hybridomas were produced which secreted monoclonal antibodies to bovine respiratory syncytial virus (BRSV). Two antibodies (8G12, 15C7) neutralized the virus and inhibited syncytia formation in vitro. These monoclonal antibodies also stained, by indirect fluorescent assay, an external envelope protein of living virus-infected cells, and recognized the 48k subunit of the viral fusion protein by Western blot analysis of bovine respiratory syncytial virus-infected cell lysates. Three other monoclonals (6A12, 14D3, 14E3) stained, by indirect fluorescent assay, acetone-fixed virus-infected cells but not living cells. Three hybridomas (6A12, 8G12, 15C7) secreted monoclonal antibody of isotype IgG1, k; two hybridomas secreted monoclonal antibody of isotype IgG2a, k. This apparently is the first report of monoclonal antibodies specific for BRSV glycoproteins.