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Related Experiment Videos

A selective differential medium for Enterobacter sakazakii, a preliminary study.

Carol Iversen1, Patrick Druggan, Stephen Forsythe

  • 1School of Science, The Nottingham Trent University, Clifton Lane, Nottingham, NG11 8NS, UK.

International Journal of Food Microbiology
|September 15, 2004
PubMed
Summary

A new chromogenic medium, Druggan-Forsythe-Iversen (DFI) agar, selectively detects the pathogen Enterobacter sakazakii in infant formula. This method identifies the bacteria faster and more accurately than current standards, improving infant safety.

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Area of Science:

  • Microbiology
  • Food Safety
  • Clinical Diagnostics

Background:

  • Enterobacter sakazakii poses a fatal risk to neonates, particularly through contaminated powdered infant milk formula.
  • Current detection methods for Enterobacter sakazakii are time-consuming and may lead to false negatives, endangering infant health.
  • Selective and rapid detection of this pathogen is crucial for ensuring the safety of infant nutrition products.

Purpose of the Study:

  • To introduce and evaluate a novel chromogenic medium, Druggan-Forsythe-Iversen (DFI) agar, for the selective detection of Enterobacter sakazakii.
  • To compare the efficacy of DFI agar against the conventional method using violet red bile glucose agar (VRBGA) and biochemical profiling.
  • To assess the specificity and sensitivity of DFI agar in identifying Enterobacter sakazakii in clinical and food samples.

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Main Methods:

  • Development of DFI agar utilizing the alpha-glucosidase reaction with 5-bromo-4-chloro-3-indolyl-alpha,D-glucopyranoside (XalphaGlc) for visual detection.
  • Comparison of DFI agar with VRBGA followed by tryptone soy agar (TSA) and Biomerieux API20E for 95 clinical and food strains of Enterobacter sakazakii.
  • Evaluation of DFI agar's performance against 148 strains from 17 non-Enterobacter sakazakii Enterobacteriaceae genera.

Main Results:

  • DFI agar detected 95 strains of Enterobacter sakazakii two days faster than the conventional VRBGA method.
  • DFI agar demonstrated high specificity, with only minor false positive rates among specific non-Enterobacter sakazakii strains (e.g., Escherichia vulneris, Pantoea spp., Citrobacter koseri).
  • The DFI medium effectively differentiates Enterobacter sakazakii in mixed cultures, unlike VRBGA, and avoids potential false negatives associated with API20E analysis.

Conclusions:

  • The DFI chromogenic medium provides a more rapid and reliable method for the selective detection of Enterobacter sakazakii compared to existing techniques.
  • This improved detection capability is vital for preventing outbreaks of neonatal infections linked to contaminated infant formula.
  • DFI agar enhances food safety protocols by offering a superior tool for identifying this critical foodborne pathogen.