Abstract
Serum antibodies to Vi antigen were detected in mice immunized with the purified antigen but not with Vi-bearing Salmonella typhi whole cells. Fusion of the spleen cells from one of the Vi antibody-producing mice with NSI myeloma cells produced four stable hybridomas that secreted antibodies to Vi. Monoclonal antibodies from these four clones were all of the immunoglobulin G class and, as determined by competition, appeared to have the same epitope specificity. Despite their immunoglobulin G nature, mouse ascitic fluids induced by one of the hybridomas strongly agglutinated the Vi-positive strains of S. typhi, S. dublin, and Citrobacter strain 5396/38. Thus, 10 clinical isolates of S. typhi but not 98 strains of other bacteria were reactive in slide agglutination tests with the monoclonal antibodies.
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