Characterization of Staphylococcus aureus strains and evidence for the involvement of non-classical enterotoxin genes in food poisoning outbreaks

FEMS Microbiol Lett. 2018 Jul 1;365(13). doi: 10.1093/femsle/fny139.

Abstract

To an increasing extent, molecular and genetic characterization is now used to investigate foodborne outbreaks. The aim of this study was to seek molecular links among coagulase-positive staphylococci (CPS) isolated from three recent food poisoning outbreaks in Romania using polymerase chain reaction and pulsed-field gel electrophoresis techniques. The 19 CPS isolates were identified as Staphylococcus aureus by detection of the 23S rDNA gene. Among them, 15 carried at least one staphylococcal enterotoxin-encoding gene. The Calaraşi outbreak strains grouped in pulsotype 2 and were sed/sej/ser-positive, whereas the Arad outbreak strains clustered in pulsotype 17 and were either sed/seg/sei/sej/ser- or seg/sei-positive. The Piteşti outbreak strains clustered in pulsotype 1 and, surprisingly, possessed only one enterotoxin gene, i.e. seh. Similar to other European countries, the seh gene has been identified with increasing frequency in Romanian outbreaks; this highlights the importance of considering the application of methods recommended for staphylococcal enterotoxin regulation in Europe.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Cattle
  • Cheese / microbiology
  • Disease Outbreaks
  • Enterotoxins / genetics
  • Enterotoxins / metabolism*
  • Food Contamination / analysis
  • Food Microbiology
  • Foodborne Diseases / epidemiology
  • Foodborne Diseases / microbiology*
  • Humans
  • Milk / microbiology
  • Phylogeny
  • Romania / epidemiology
  • Staphylococcal Infections / epidemiology
  • Staphylococcal Infections / microbiology*
  • Staphylococcus aureus / classification
  • Staphylococcus aureus / genetics
  • Staphylococcus aureus / isolation & purification*
  • Staphylococcus aureus / metabolism

Substances

  • Enterotoxins