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Characterization of Pajaroellobacter abortibovis, the etiologic agent of epizootic bovine abortion.
Veterinary Microbiology 2016 August 31
Epizootic bovine abortion (EBA), first identified in the 1950s, is a major contributor of economic loss to western U.S. beef producers. The causative agent proved elusive for over fifty years until a novel Deltaproteobacteria was identified as the etiologic agent in 2005. The microbe, which has yet to be successfully cultured in vitro, has proven difficult to purify from necropsy tissues. Thus, phylogenetic characterization has been limited to analysis of the 16S ribosomal RNA (rRNA) gene (AF503916), which placed this bacterium in the order Myxococcales, suborder Sorangiineae, family Polyangiaceae and most closely related to Sorangium cellulosum. The focus of the current study was to further expand the morphologic characterization and taxonomic placement of this bacteria, named here as Pajaroellobacter abortibovis. Modified Gram staining, combined with transmission electron microscopy, provide strong evidence that the bacterium is gram negative. Flow cytometric analysis identified the presence of P. abortibovis in murine leukocytes. While attempts to sequence ten universally conserved protein-coding genes using previously published degenerative primers failed, redesigned primers based solely upon Deltaproteobacteria facilitated the partial sequencing of two genes; fusA (JQ173112) and pyrG (JQ173111). Primers designed in a similar fashion generated a partial sequence of the 23S rRNA gene (JQ173113) These sequences, combined with a revised 16S rRNA phylogenic analysis, support the placement of this bacteria as a unique genus separate from Sorangium.
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