Abstract
A preparation of Brucella abortus cytoplasmic proteins was depleted of lipopolisaccharyde (LPS) by immunoadsorption with a monoclonal antibody (BC68) specific for the O antigen of B. abortus smooth LPS. This extract was used as antigen in an indirect ELISA for measuring antiprotein humoral immune response in dogs suffering from brucellosis and in healthy controls. All of the affected dogs studied showed IgG antiprotein response, while 2% (2 of 103) of the healthy dogs used as controls gave a positive result. All sera found to be positive by ELISA were also positive by the rapid slide agglutination test. These preliminary results show that the ELISA using B. abortus cytoplasmic proteins could be useful for the specific diagnosis of canine brucellosis.
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