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We describe a retrospective analysis of Brucella enzyme immunoassay (EIA) IgM and IgG results compared to those of the standard tube agglutination test (SAT). Among 1,091 samples tested, 104 (9.5%) and 24 (2.2%) sera were positive by IgM and IgG EIA, respectively. Supplemental testing by SAT showed that 82.7% (86/104) of IgM EIA-reactive samples and 54.2% (13/24) of IgG EIA-reactive samples were negative by SAT. Testing all EIA screen-reactive samples by SAT is required when evaluating patients for potential brucellosis. Due to the limitations of serology, culture remains the gold standard for detecting Brucella infection.

clinical and vaccine immunology

A High Percentage of Serum Samples That Test Reactive by Enzyme Immunoassay for Anti-Brucella Antibodies Are Not Confirmed by the Standard Tube Agglutination Test