Rapid detection of Enterobacter sakazakii using TaqMan real-time PCR assay

J Microbiol Biotechnol. 2007 Mar;17(3):516-9.

Abstract

Enterobacter sakazakii is an emerging food pathogen, which induces severe meningitis and sepsis in neonates and infants, with a high fatality rate. The disease is generally associated with the ingestion of contaminated infant formula. In this study, we describe the development of a real-time PCR protocol to identify E. sakazakii using a TaqMan probe, predicated on the nucleotide sequence data of the 16S rRNA gene obtained from a variety of pathogens. To detect E. sakazakii, four primer sets and one probe were designed. Five strains of E. sakazakii and 28 non-E. sakazakii bacterial strains were used in order to ensure the accuracy of detection. The PCR protocol successfully identified all of the E. sakazakii strains, whereas the 28 non-E. sakazakii strains were not detected by this method. The detection limits of this method for E. sakazakii cells and purified genomic DNA were 2.3 CFU/assay and 100 fg/assay, respectively. These findings suggest that our newly developed TaqMan real-time PCR method should prove to be a rapid, sensitive, and quantitative method for the detection of E. sakazakii.

Publication types

  • Evaluation Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Bacterial Typing Techniques*
  • Colony Count, Microbial
  • Cronobacter sakazakii / classification*
  • Cronobacter sakazakii / genetics
  • Cronobacter sakazakii / isolation & purification
  • DNA Probes
  • DNA, Bacterial / analysis
  • Food Microbiology
  • Humans
  • Infant Food / microbiology*
  • Polymerase Chain Reaction / methods*
  • RNA, Ribosomal, 16S / genetics*
  • Sensitivity and Specificity
  • Species Specificity
  • Taq Polymerase / metabolism*
  • Time Factors

Substances

  • DNA Probes
  • DNA, Bacterial
  • RNA, Ribosomal, 16S
  • Taq Polymerase