Quantitative duplex taqman real-time polymerase chain reaction for the assessment of the etiologic agent of epizootic bovine abortion

Roxann S. Brooks, Myra Blanchard, Mark L Anderson, Mark R. Hall, Jeffrey L Stott

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

Epizootic bovine abortion (EBA), also commonly known as "foothill abortion," is a late-term abortion primarily in beef cattle with significant economic impacts in California, Nevada, and Oregon. The causative agent is a novel deltaproteobacterium (aoEBA) closely related to the order Myxococcales and vectored by the soft-shelled tick Ornithodoros coriaceus. Historically, diagnosis has relied upon the pathologic examination of the fetus and the presence of elevated fetal serum immunoglobulins. Identification of the etiologic agent, a unique deltaproteobacterium, permitted the development of a quantitative duplex real-time polymerase chain reaction (qPCR) using a unique 90-bp sequence of aoEBA 16S ribosomal RNA gene in conjunction with an 88-bp sequence of the bovine β-actin gene. Reaction efficiencies were 100.9% for the 16S aoEBA gene and 93.1% for the bovine β-actin gene. Application of the duplex TaqMan to a set of aoEBA-infected fetal bovine necropsy tissues demonstrated the assay to be robust in quantitatively identifying the aoEBA bacteria and establishing host-tissue pathogen load. Consistent with previously reported immunohistochemical data, organized lymphoid tissue generally carried the heaviest bacterial load as compared to non-lymphoid tissue. The newly developed duplex TaqMan assay will facilitate diagnosis in difficult cases and provide an invaluable tool for delineating the pathogenesis of EBA.

Original languageEnglish (US)
Pages (from-to)1153-1159
Number of pages7
JournalJournal of Veterinary Diagnostic Investigation
Volume23
Issue number6
DOIs
StatePublished - Nov 2011

Keywords

  • Deltaproteobacteria
  • epizootic bovine abortion
  • polymerase chain reaction

ASJC Scopus subject areas

  • veterinary(all)

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