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Lett Appl Microbiol. 2014 Mar;58(3):292-8. doi: 10.1111/lam.12189. Epub 2013 Nov 18.

MALDI-TOF MS for identification of porcine Brachyspira species.

Author information

1
Vetsuisse Faculty, Institute of Veterinary Bacteriology, University of Zurich, Zurich, Switzerland.

Abstract

The aim of this study consisted in evaluating MALDI-TOF MS as a tool for the identification of the genus Brachyspira (B.) and its relevant species for the pig industry. First, a database was created with 30 control strains, and superspectra for five different porcine Brachyspira species were calculated. In a second step, 67 field isolates were investigated using MALDI-TOF MS, and results were compared to those obtained using nox gene-based RFLP (reference method) and biochemical tests. Among the 67 field isolates, five different Brachyspira species were detected using nox gene-based RFLP analysis. MALDI-TOF MS analysis correctly assigned all isolates to the genus Brachyspira and identified all isolates from B. hyodysenteriae (29/29), B. pilosicoli (11/11), B. intermedia (4/4) and B. innocens (11/11). In terms of B. murdochii, MALDI-TOF MS assigned one of 12 isolates ambiguously as B. innocens/B. murdochii. The results of this study indicate that MALDI-TOF MS facilitates the diagnosis of swine dysentery and porcine intestinal spirochaetosis.

SIGNIFICANCE AND IMPACT OF THE STUDY:

Current methods for the discrimination of pathogenic Brachyspira hyodysenteriae and Brachyspira pilosicoli from Brachyspira species with low pathogenic potential have proven to be laborious and time-consuming and are therefore not suitable for routine diagnostics. This study describes the evaluation of MALDI-TOF MS for the identification of different porcine Brachyspira species in routine diagnostic laboratories. The results suggest that MALDI-TOF MS is an effective method for the identification of porcine Brachyspira spp. and accelerates diagnosis of swine dysentery and porcine intestinal spirochaetosis.

KEYWORDS:

Brachyspira; MALDI-TOF MS; pigs; porcine intestinal spirochaetosis; swine dysentery

PMID:
24236892
DOI:
10.1111/lam.12189
[Indexed for MEDLINE]
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