A simple enzyme immunoassay was developed and evaluated for serological diagnosis of brucellosis in 25 patients with various forms of brucellosis and 292 control patients with other conditions and disorders. All brucellosis patients gave a positive test with the initial sample. In 3 acute, febrile brucellosis patients with follow-up sera taken during therapy a sharp drop in specific antibody was noted. There was a less pronounced antibody reduction in 1 chronic and 2 relapse patients and an antibody increase in 1 chronic and 1 relapse case. All control samples gave negative results. In addition, the assay was evaluated as a screening test with 315 sera from 'healthy' individuals living in a brucellosis focus and representing 15% of that population. 11.5% (34/293) of subjects with no reported history of brucellosis and 45% (10/22) of cases treated in the past gave a positive test result. The agreement in those samples between the assay and the serum agglutination test was 95.5%.
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