Improving the specificity of immunodiagnosis for porcine brucellosis

Vet Res Commun. 2008 Mar;32(3):209-13. doi: 10.1007/s11259-007-9023-9. Epub 2007 Oct 13.


This report describes the use of cell mediated immunity to improve specificity of current diagnosis for Brucella suis. Diagnosis is problematic due to cross reactions that lead to false positive serological reactions (FPSR) in the standard diagnostic tests. A common cause of this cross reactivity is infection with the organism Yersinia enterocolitica O:9. Gottingen mini-pigs were experimentally infected with B. suis biovar I field strain or Y. enterocolitica serotype O:9 biotype 3. Infection was followed for 70 days. During this time whole blood stimulation assays were set up using Brucella specific antigen. IFNgamma was measured in the supernatants (SN) from these assays by ELISA. Concurrent standard serological tests were carried out. The results indicate that the IFNgamma assay is specifically able to distinguish Y. enterocolitica O:9 infection from a B. suis infection in experimentally infected mini-pigs. These results represent an improvement in diagnostic specificity compared to currently used serological tests. Thus suggesting that in a surveillance setting this test could be applied as a confirmatory test in the face of FPSR.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Analysis of Variance
  • Animals
  • Antibodies, Bacterial / blood
  • Antibodies, Bacterial / metabolism
  • Brucella suis / isolation & purification*
  • Brucellosis / diagnosis
  • Brucellosis / immunology
  • Brucellosis / veterinary*
  • Enzyme-Linked Immunosorbent Assay / methods
  • Enzyme-Linked Immunosorbent Assay / standards
  • Enzyme-Linked Immunosorbent Assay / veterinary*
  • Female
  • Interferon-gamma / blood*
  • Interferon-gamma / immunology
  • Population Surveillance / methods
  • Swine
  • Swine Diseases / diagnosis*
  • Swine Diseases / immunology
  • Swine, Miniature
  • Time Factors
  • Yersinia Infections / diagnosis
  • Yersinia Infections / veterinary
  • Yersinia enterocolitica / isolation & purification


  • Antibodies, Bacterial
  • Interferon-gamma