Monoclonal antibodies (MAbs) to plum pox virus (PPV) were obtained after immunization of BALB/c mice with purified PPV-W isolate. Spleen cells from a mouse showing a high serum titer were used for fusion with Sp2/0-Ag14 myeloma cells. Culture supernatants were screened for specific antibody production against PPV-W isolate using indirect ELISA. A total of six stable hybridoma lines producing MAbs of IgG class were obtained. All four PPV isolates tested (W, A, D and M) can be distinguished by these MAbs. Two highly efficient antibodies were chosen for practical purposes, and their applicability in PPV diagnostics has been studied since 1989 in parallel with polyclonal antibodies and commercial kits (Boehringer, Bioreba). The experiments have proven comparable sensitivity with a detection limit ranging between 10 and 50 ng of virus per ml sample. In routine diagnostics of plums, peaches and apricots our MAbs ranked at least as high as the commercial kits.
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