A Monoclonal Antibody Specific for the A Antigen of Brucella spp.

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Abstract
Two murine monoclonal antibodies of the IgG3 class were isolated after immunization with B. abortus. An indirect immunofluorescence test was used to screen hybridoma supernatants and subsequently to determine the cross-reactivity of the monoclonal antibodies with other bacteria. One monoclonal antibody reacted with all the smooth Brucella biotypes tried and with Yersinia enterocolitica serogroup O:9, though not with rough B. ovis or with strains of Escherichia, Proteus, Salmonella, Pseudomonas, Francisella and Bordetella. The other monoclonal antibody displayed a high degree of specificity for brucellae carrying the A lipopolysaccharide-protein surface antigen. The implications for the diagnosis of brucellosis are discussed.

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