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Cross-reactions in specific Brachyspira spp. PCR assays caused by "Brachyspira hampsonii" isolates: implications for detection.

Authors
  • Aller-Morán, Luis M1
  • Martínez-Lobo, F Javier2
  • Rubio, Pedro2
  • Carvajal, Ana2
  • 1 Department of Infectious Diseases and Epidemiology, Veterinary Faculty, University of León, León, Spain [email protected]
  • 2 Department of Infectious Diseases and Epidemiology, Veterinary Faculty, University of León, León, Spain.
Type
Published Article
Journal
Journal of veterinary diagnostic investigation : official publication of the American Association of Veterinary Laboratory Diagnosticians, Inc
Publication Date
November 2016
Volume
28
Issue
6
Pages
755–759
Identifiers
PMID: 27664096
Source
Medline
Keywords
License
Unknown

Abstract

An emerging novel spirochete in swine, provisionally designated "Brachyspira hampsonii," has been detected worldwide. It has been associated with swine dysentery and cannot be differentiated from B. hyodysenteriae, the classical etiologic agent of this disease, using standard phenotypic methods. We evaluated cross-reactions of "B. hampsonii" isolates recovered from avian species in some of the currently available species-specific polymerase chain reaction (PCR) assays for the identification of swine Brachyspira species. Ten avian "B. hampsonii" isolates recovered from wild waterfowl were used. No false-positive results were recorded with a B. pilosicoli-specific PCR based on the amplification of a fragment of the 16S rRNA gene. However, the percentage of false-positive results varied, with a range of 10-80%, in the evaluated B. hyodysenteriae-specific assays based on the amplification of the 23S rRNA, nox, and tlyA genes. Similarly, results of the B. intermedia-specific PCR assays yielded poor specificity, with up to 80% of the "B. hampsonii" isolates tested giving false-positive results. Finally, 2 "B. hampsonii" avian isolates yielded a positive result in a B. innocens- and B. murdochii-specific PCR. This result should be interpreted very cautiously as these 2 isolates could represent a recombinant genotype.

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