Abstract
Monoclonal antibodies were produced in vitro by fusing mouse myeloma cells P 3-X63-AgU 1 with spleen cells derived from BALB/c mice immunized with purified sweet clover necrotic mosaic virus (SCNMV). Twenty-one out of 47 clones which secreted monoclonal antibodies of high titres against SCNMV were injected intraperitoneally into mice previously primed with Pristane. The ascites fluid harvested 10 to 14 days later showed a strong and specific anti-SCNMV activity in reverse passive haemagglutination inhibition, passive haemagglutination and indirect enzyme linked immunosorbent assay. The monoclonal antibodies of the 21 clones did not react with red clover necrotic mosaic virus (Swedish isolate). The class and subclass of immunoglobulins of the monoclonal antibodies secreted by established cultures were determined to be IgG2a for 15 clones and IgG3 for 6 clones.
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