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Differentiation between active and inactive human brucellosis by measuring antiprotein humoral immune responses



Differentiation between active and inactive human brucellosis by measuring antiprotein humoral immune responses



Journal of Clinical Microbiology 30(3): 604-607



A preparation of Brucella abortus cytoplasmic proteins was depleted of lipopolysaccharide (LPS) by immunoadsorption with a monoclonal antibody (MAb), BC68, specific for the O antigen of B. abortus smooth LPS. Two enzyme-linked immunosorbent assy (ELISA) systems were developed and used in this study. The first system includes an LPS-free cytoplasmic protein preparation; the second one was based on antigen capture on MAb BC68. By using these systems, we have demonstrated that 94% (33 of 35) of the brucellosis patients studied showed immunoglobulin G antiprotein response and also that all of the patients showed a strong anti-LPS reactivity. Thirty-six serologically positive individuals with no active infection at the time of examination (SPI) were also included. No immunoglobulin G antibodies against proteins were detected in 34 of them (92%), whereas 31 SPI (86%) showed various degrees of anti-LPS reactivity. The use of the of the LPS-free protein extract in ELISAs made it possible to establish differential reactivity patterns between active and inactive brucellosis.

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Accession: 002072887

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PMID: 1551977


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