Genomic characterization of coagulase-negative staphylococci including methicillin-resistant Staphylococcus sciuri causing bovine mastitis

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Khazandi, M., Al-Farha, A.A-B, Coombs, G.W., O’Dea, M., Pang, S., Trott, D.J., Aviles, R.R., Hemmatzadeh, F., Venter, H., Ogunniyi, A.D., Hoare, A., Abraham, S. and Petrovski, K.R. (2018) Genomic characterization of coagulase-negative staphylococci including methicillin-resistant Staphylococcus sciuri causing bovine mastitis. Veterinary Microbiology, 219 . pp. 17-22.

Link to Published Version: https://doi.org/10.1016/j.vetmic.2018.04.004
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Abstract

Methicillin-resistant coagulase-negative staphylococci (MRCoNS) have recently emerged as a significant cause of bovine mastitis worldwide. Here we describe the isolation of MRCoNS from cases of bovine mastitis from a single dairy farm in Australia. Fourteen CoNS isolates were identified as MRCoNS on the basis of having an oxacillin MIC of ≥0.5 μg/mL. The isolates were speciated as S. chromogenes (n = 1) S. fleurettii (n = 1), S. haemolyticus (n = 2), S. sciuri (n = 5), S. simulans (n = 1) S. succinus (n = 2) and S. xylosus (n = 2). Five of the isolates (S. fleuretti, S. haemolyticus S. sciuri and two S. succinus) were mecA-positive. We also detected a previously described S. sciuri mecA homolog in four oxacillin-resistant S. sciuri isolates. The remainder of the putative MRCoNS did not contain any mecA-related resistance determinants in their genomes. Comparative genomic analysis of three previously published S. sciuri isolates, from humans, a squirrel and a cereal crop (rice), and a representative isolate from our study demonstrated clustering and a high degree of genetic homogeneity (>95%), suggesting S. sciuri has low host specificity. In conclusion, CoNS, in particular S. sciuri, may act as a reservoir for SCCmec elements that can easily be spread between different host species by direct cross-infection.

Publication Type:	Journal Article
Murdoch Affiliation:	School of Veterinary and Life Sciences
Publisher:	Elsevier BV
Copyright:	© 2018 Elsevier B.V.
URI:	http://researchrepository.murdoch.edu.au/id/eprint/40713

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