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Journal of Clinical Microbiology, Feb 1996, 477-478, Vol 34, No. 2
Copyright © 1996 by the American Society for Microbiology. All rights reserved.

Rapid laboratory confirmation of human brucellosis by PCR analysis of a target sequence on the 31-kilodalton Brucella antigen DNA

GM Matar, IA Khneisser and AM Abdelnoor
Department of Microbiology and Immunology, Faculty of Medicine, American University of Beirut, New York 10022, USA.

We developed a PCR-based assay for the rapid and specific laboratory diagnosis of human brucellosis directly from whole blood. Specimens were collected in EDTA tubes from 17 patients with acute serologic brucellosis and 3 patients with chronic relapsing brucellosis as determined by serologic tests and the patient's clinical picture. DNA was extracted from peripheral mononuclear cells obtained from the blood of patients with brucellosis and control individuals. Specific primers for the PCR amplification of a 223-bp region on the sequence encoding the 31-kDa immunogenic Brucella abortus protein (BCSP 31) were used. All amplicons had the expected size of 223 bp. The specificity of amplification was determined by Southern hybridization and restriction endonuclease analysis. DNA extracted from blood taken from 30 healthy individuals as well as from 9 patients with typhoid fever did not show any amplification with the primers used. The test proved to be rapid and specific for the laboratory confirmation of acute human brucellosis. Further studies must be conducted to assess the utility of this test on additional patients with chronic relapsing brucellosis as well as patients under treatment.


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