Phylogenetic Analysis of Staphylococcus aureus CC398 Reveals a Sub-Lineage Epidemiologically Associated with Infections in Horses

Mohamed M. H. Abdelbary, Anne Wittenberg, Christiane Cuny, Franziska Layer, Kevin Kurt, Lothar H. Wieler, Birgit Walther, Robert Skov, Jesper Larsen, Henrik Hasman, J. Ross Fitzgerald, Tara C. Smith, J. A. Wagenaar, Annalisa Pantosti, Marie Hallin, Marc J. Struelens, Giles Edwards, R. Boese, Ulrich Nuebel, Wolfgang Witte

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Abstract

In the early 2000s, a particular MRSA clonal complex (CC398) was found mainly in pigs and pig farmers in Europe. Since then, CC398 has been detected among a wide variety of animal species worldwide. We investigated the population structure of CC398 through mutation discovery at 97 genetic housekeeping loci, which are distributed along the CC398 chromosome within 195 CC398 isolates, collected from various countries and host species, including humans. Most of the isolates in this collection were received from collaborating microbiologists, who had preserved them over years. We discovered 96 bi-allelic polymorphisms, and phylogenetic analyses revealed that an epidemic sub-clone within CC398 (dubbed 'clade (C)') has spread within and between equine hospitals, where it causes nosocomial infections in horses and colonises the personnel. While clade (C) was strongly associated with S. aureus from horses in veterinary-care settings (p = 2x10(-7)), it remained extremely rare among S. aureus isolates from human infections.
Original languageEnglish
Article numbere88083
JournalPLOS ONE
Volume9
Issue number2
Number of pages7
ISSN1932-6203
DOIs
Publication statusPublished - 2014

Keywords

  • MULTIDISCIPLINARY
  • METHICILLIN-RESISTANT
  • VETERINARY PERSONNEL
  • HUMAN TRANSMISSION
  • SLAUGHTER PIGS
  • STRAIN ST398
  • RISK-FACTORS
  • MRSA
  • ANIMALS
  • COLONIZATION
  • EMERGENCE

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