Characterization of drug resistance and virulotypes of Salmonella strains isolated from food and humans

Foodborne Pathog Dis. 2013 Nov;10(11):963-8. doi: 10.1089/fpd.2013.1511. Epub 2013 Oct 8.

Abstract

The virulence of bacteria can be evaluated through both phenotypic and molecular assays. We applied these techniques to 114 strains of Salmonella enterica subsp. enterica collected from July 2010 to June 2012. Salmonella strains were of human origin (71/114) or isolated from food (43/114). The strain set included only the three predominant Salmonella serovars isolated in Italy from humans (S. Enteritidis, S. Typhimurium, S. 4,[5],12:i:-). These strains were screened via polymerase chain reaction for 12 virulence factors (gipA, gtgB, sopE, sspH1, sspH2, sodC1, gtgE, spvC, pefA, mig5, rck, srgA), while antimicrobial sensitivity was evaluated through the Kirby-Bauer assay. Fifty-nine different virulence profiles were highlighted; the genes showing the highest homology were those related to the presence of prophages (gipA, gtgB, sopE, sspH1, sspH2, sodC1, gtgE), while the genes related to the presence of plasmids were less frequently detected (spvC, pefA, mig5, rck, srgA). The Salmonella serovars Typhimurium and 4,[5],12:i:- were closely related in terms of both virulotyping and antibiotic resistance. S. Enteritidis showed higher antibiotic sensitivity and a higher prevalence of genes related to plasmids.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Anti-Bacterial Agents / pharmacology
  • Bacteriophage Typing
  • Drug Resistance, Bacterial*
  • Food Contamination*
  • Food Microbiology
  • Genes, Bacterial
  • Humans
  • Plasmids / genetics
  • Polymerase Chain Reaction
  • Prophages
  • Salmonella enterica / classification*
  • Salmonella enterica / drug effects
  • Salmonella enterica / pathogenicity
  • Salmonella enterica / virology
  • Salmonella typhimurium / classification*
  • Salmonella typhimurium / drug effects
  • Salmonella typhimurium / pathogenicity
  • Salmonella typhimurium / virology
  • Virulence Factors / genetics

Substances

  • Anti-Bacterial Agents
  • Virulence Factors