A combined PCR and selective enrichment method for rapid detection of Listeria monocytogenes

Stephen Fitter, M. Heuzenroeder, C. J. Thomas

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Development of a routine detection assay for Listeria monocytogenes in foods that uses the polymerase chain reaction (PCR) and enrichment cultures was investigated. Oligonucleotide primers were chosen to amplify a 3’region of L. monocytogenes hlyA gene spanning a conserved HindIII site. PCR detection sensitivity for L. monocytogenes in dilutions of pure enrichment cultures was between 50 and 500 colony forming units. A short enrichment period before PCR amplification allowed detection of the organisms in a range of complex foods contaminated with 104 cfu/g. Detection sensitivity for the assay in the presence of chicken skin and soft cheese was determined at 10–100 cfu/g. Utilization of enrichment cultures and PCR allowed identification of the organism within 24 h or 2 days.

Original languageEnglish
Pages (from-to)53-59
Number of pages7
JournalJournal of Applied Bacteriology
Issue number1
Publication statusPublished or Issued - 1 Jan 1992
Externally publishedYes

ASJC Scopus subject areas

  • Microbiology
  • Applied Microbiology and Biotechnology

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