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Bulletin No. 27 - Summer 2007
BacterologyBrucella suis
YUNGERSEN G, SØRENSEN V, GIESE SB, STACK JA, RIBER U
Differentiation between serological responses to Brucella suis and Yersinia enterocolitica serotype O:9 after natural or experimental infection in pigs.
Epidemiology and Infection, 2006, Volume 134, 347-357
False-positive serological reactions (FPSR) caused by Yersinia enterocolitica serotype O:9 (YeO:9) frequently occurs in tests for brucellosis so that surveillance testing for brucellosis does not result reliable. To answer this issue, the serological reactions in pigs experimentally and naturally infected with YeO:9 or Brucella suis biovar 2 were investigated using classical and novel tests for brucellosis. In experimentally inoculated animals, FPSR was shown to occur for a limited period of time, i.e. 2-9 weeks post-YeO:9-inoculation. By contrast, B. suis-inoculated pigs resulted positive throughout the duration of the study, i.e. 21 weeks. Such discrepancy in the duration of the serological responses between animals infected by one or the other bacterium was confirmed in naturally infected herds suggesting that it is a reliable tool to discriminate between B. suis and YeO:9 infections.
