Prevalence and characterization of Listeria monocytogenes, Salmonella and Shiga toxin-producing Escherichia coli isolated from small Mexican retail markets of queso fresco

Marcela Soto Beltran, Charles P. Gerba, Anna Porto Fett, John B. Luchansky, Cristobal Chaidez

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

Queso fresco (QF) is a handmade cheese consumed and produced in Latin America. In Mexico, QF production is associated with a microbiological risk. The aim of the study was to determine the incidence and characterization of Listeria monocytogenes, Salmonella spp., and Shiga toxin-producing Escherichia coli (STEC) in QF from retail markets of the north-western State of Sinaloa, Mexico, and to assess the effect of physicochemical parameters on Listeria presence. A total of 75 QF samples were obtained. L. monocytogenes, E. coli, and coliforms were detected in 9.3, 94, and 100 %, respectively. Salmonella was not detected. STEC isolates showed virulence genes. Microbial loads were above the maximum values recommended by the Official Mexican Standards. Physicochemical parameters such as water activity (aw), moisture content, pH, and salinity played a role in Listeria prevalence in QF. Rigorous control in QF made in Culiacan, Mexico is needed to reduce the risk of foodborne pathogens.

Original languageEnglish (US)
Pages (from-to)140-148
Number of pages9
JournalInternational Journal of Environmental Health Research
Volume25
Issue number2
DOIs
StatePublished - Mar 4 2015

Keywords

  • Escherichia coli
  • Food safety
  • Listeria monocytogenes
  • Queso fresco
  • Salmonella
  • Shiga toxin

ASJC Scopus subject areas

  • Pollution
  • Public Health, Environmental and Occupational Health
  • Health, Toxicology and Mutagenesis

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