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Pig Journal Volume: 51
Publication date: June 2003

Proceedings Section

STUDIES ON PUTATIVE VIRULENCE GENES OF PORCINE BRACHYSPIRA SPECIES
C.A. Walker, B.P. Murray, J.R. Thomson and K. Sumption

Abstract
This paper reviews the putative virulence factors associated with porcine Brachyspira species including haemolysins, motility factors, iron transport systems, mucus attraction genes, outer-membrane proteins, adhesion factors and oxygen metabolism (NAD oxidase). Thereafter an overview is given of a molecular-based study on putative virulence genes in Brachyspira field isolates, comparing their prevalence in virulent isolates of B. hyodysenteriae with that in mild/non-virulent isolates of this species. Of the six putative virulence genes studied, only the glucose-galactose lipoprotein gene MglB showed a significantly higher prevalence in virulent B. hyodysenteriae as compared with mild/non-virulent isolates. This gene shows potential for further study towards classifying B. hyodysenteriae in terms of virulence potential.

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