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Epidemiological studies have identified  Staphylococcus aureus  as the most common agent involved in food poisoning. However, current research highlights the importance of toxigenic coagulase-negative staphylococci (CoNS) isolated from food. The aim of this study was to characterize  Staphylococcus  spp. isolated from cows with bovine subclinical mastitis regarding the presence of genes responsible for the production of staphylococcal enterotoxins and of the  tst- 1 gene encoding toxic shock syndrome toxin 1, and to determine the clonal profile of the isolates carrying any of the genes studied. A total of 181 strains isolated in different Brazilian states, including the South, Southeast, and Northeast regions, were analyzed. The  sea  gene was the most frequent, which was detected in 18.2% of the isolates, followed by  seb  in 7.7%,  sec  in 14.9%,  sed  in 0.5%,  see  in 8.2%,  seg  in 1.6%,  seh  in 25.4%,  sei  in 6.6%, and  ser  in 1.6%. The  sej ,  ses ,  set , and  tst- 1 genes were not detected in any of the isolates. The typing of the isolates by pulsed-field gel electrophoresis revealed important  S. aureus  and  S. epidermidis  clusters in different areas and the presence of enterotoxin genes in lineages isolated from animals that belong to herds located geographically close to each other.

toxins

Detection of Enterotoxigenic Potential and Determination of Clonal Profile in Staphylococcus aureus and Coagulase-Negative Staphylococci Isolated from Bovine Subclinical Mastitis in Different Brazilian States