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. 1992 Dec;30(12):3168–3174. doi: 10.1128/jcm.30.12.3168-3174.1992

Antibody response to Brucella outer membrane proteins in bovine brucellosis: immunoblot analysis and competitive enzyme-linked immunosorbent assay using monoclonal antibodies.

A Cloeckaert 1, P Kerkhofs 1, J N Limet 1
PMCID: PMC270611  PMID: 1452700

Abstract

Sera from Brucella-infected bovines were analyzed by immunoblotting by using sonicated cell extracts of B. melitensis or B. abortus and a competitive enzyme-linked immunosorbent assay (ELISA) with monoclonal antibodies against outer membrane proteins (OMPs) with molecular masses of 10, 16.5, 19, 25 to 27, 36 to 38, and 89 kDa. Antibody responses against OMPs were compared with antibody responses against smooth lipopolysaccharide. Immunoblot analysis indicated that the antibody response in infected animals was largely different from one animal to another. The antigens of concern were OMPs with molecular masses of 10, 16.5, 19, 25 to 27, 36 to 38, and 89 kDa and other proteins with molecular masses of between 40 and 80 kDa. According to the specificity of the competitive ELISA, OMPs useful for the detection of infected animals are the OMPs of 10, 16.5, 19, 25 to 27, and 36 to 38 kDa. A competitive ELISA with the anti-89 kDa monoclonal antibody was not specific. Results of the competitive ELISA confirmed the individual variability of the humoral immune response against OMPs. It therefore seems that a combination of several protein antigens is necessary for the development of an immunoassay with a sensitivity comparable to that of the smooth lipopolysaccharide ELISA.

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Selected References

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