Direct detection of Shigella flexneri and Salmonella typhimurium in human feces by real-time PCR

Young Geun Yang, Man Ki Song, Su Jeong Park, Suhng Wook Kim

Research output: Contribution to journalArticle

26 Citations (Scopus)


We have established a SYBR Green-based real-time PCR method using AnyDirect solution, which enhances PCR from whole blood, for direct amplification of the virA gene of Shigella flexneri and the invA gene of Salmonella typhimurium from human feces without prior DNA purification. When we compared the efficiency of conventional or real-time PCR amplification of the virA and invA genes from the supernatant of boiled feces supplemented with S. flexneri and S. typhimurium in the presence or absence of AnyDirect solution, amplification products were detected only in reactions to which AnyDirect solution had been added. The detection limit of real-time PCR was 1 × 104 CFU/g feces for S. flexneri and 2 × 104 CFU/g feces for S. typhimurium; this sensitivity level was comparable to other studies. Our real-time PCR assay with AnyDirect solution is simple, rapid, sensitive, and specific, and allows simultaneous detection of S. flexneri and S. typhimurium directly from fecal samples without prior DNA purification.

Original languageEnglish
Pages (from-to)1616-1621
Number of pages6
JournalJournal of microbiology and biotechnology
Issue number10
Publication statusPublished - 2007 Oct 1



  • Human feces
  • Realtime PCR
  • Salmonella typhimurium
  • Shigella flexneri

ASJC Scopus subject areas

  • Biotechnology
  • Applied Microbiology and Biotechnology
  • Microbiology
  • Bioengineering

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