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The prevalence, genetic diversity and antibiotic resistance of Staphylococcus aureus in milk whey and cheese from artisan farm dairies

Thomassen, Gunn Merethe Bjørge; Jakobsen, Anita Nordeng; Mehli, Lisbeth; Hoel, Sunniva; Karlsen, Hanne
Journal article, Peer reviewed
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URI
http://hdl.handle.net/11250/2433971
Date
2016
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  • Institutt for bioteknologi og matvitenskap [1689]
  • Publikasjoner fra CRIStin - NTNU [41874]
Original version
International Dairy Journal. 2016, 20-27.   http://dx.doi.org/10.1016/j.idairyj.2016.10.006
Abstract
In this study, coagulase positive staphylococci were detected in 45% of the 69 bovine milk, whey and cheese samples taken from five farm dairies, and all raw milk samples were contaminated. Genetic diversity, staphylococcal enterotoxin genes and antimicrobial susceptibility in putative Staphylococcus aureus isolates were investigated. Sixty-one percent of the 72 isolates analysed belonged to the same pulsed field gel electrophoresis group. Thespa-typing revealed seven different spa types, t2678 being the most prevalent, but t127 and t197 were also detected. Sixteen different toxin gene profiles were identified in 87.5% of the isolates with sec and ts tbeing the most frequent (52.5%), followed by seg and seh. All isolates were methicillin-sensitive S. aureus, and sensitive to the 12 antibiotics tested. The prevalence of S. aureus and the high diversity of isolates carrying enterotoxin genes constitute grounds for food safety concern in artisanal cheese making, whether pasteurised or not.
Publisher
Elsevier
Journal
International Dairy Journal

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