Helcococcus ovis, an emerging pathogen in bovine valvular endocarditis.

Journal of Clinical Microbiology
Peter KutzerMarcel Nordhoff

Abstract

The initial isolation of Helcococcus ovis from a valvular thrombus prompted us to investigate the prevalence of this bacterium in bovine valvular endocarditis. Specimens from 55 affected hearts were examined by culture using Columbia blood agar and cross streaking the inoculated plate with a Staphylococcus aureus strain. As confirmed by 16S rRNA gene sequencing, H. ovis was isolated with an unexpectedly high frequency of 33%, predominantly as heavy growth and pure culture. The majority of H. ovis isolates showed distinct satellitism around S. aureus and pyridoxal dependency, resembling "nutritionally variant streptococci" (now assigned to the genera Abiotrophia and Granulicatella). Using the API rapid ID 32 Strep, API ZYM, and Rosco Diatabs systems, incongruent results were obtained for alkaline phosphatase, beta-galactosidase, beta-glucuronidase, and leucine aminopeptidase activities. Based on the satellitism/pyridoxal dependency; hemolysis on blood agar; the API rapid ID 32 Strep results for arginine dihydrolase, alpha-galactosidase, beta-galactosidase, beta-glucuronidase, and pyroglutamic acid arylamidase activities; hippurate hydrolysis; and acidification of sucrose, a scheme for the identification of H. ovis and its differ...Continue Reading

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Citations

Oct 20, 2012·PloS One·Georgios OikonomouRodrigo Carvalho Bicalho
Nov 10, 2013·The Journal of General and Applied Microbiology·Clara LocatelliPaolo Moroni
Feb 24, 2016·Journal of Veterinary Cardiology : the Official Journal of the European Society of Veterinary Cardiology·C GerspachS Buczinski
Jun 26, 2015·The American Journal of the Medical Sciences·Lisa M DanielsLarry Baddour
Nov 1, 2013·Journal of Clinical Microbiology·Siddharth SridharKwok-Yung Yuen
May 23, 2015·Journal of Clinical Microbiology·Anne VergneVincent Cattoir
Jul 8, 2015·Applied and Environmental Microbiology·Soo Jin JeonKlibs N Galvão
Jan 9, 2015·Clinical Microbiology Reviews·Jean-Christophe LagierDidier Raoult
Jan 3, 2019·Genomics & Informatics·Soo Jin Jeon, Klibs N Galvão
Oct 21, 2019·Journal of Dairy Science·Ulrike S SorgePaul J Plummer
Sep 5, 2021·BMC Veterinary Research·Alexandra Jost, Marlene Sickinger

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