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Journal of Clinical Microbiology, November 2003, p. 5134-5146, Vol. 41, No. 11
0095-1137/03/$08.00+0     DOI: 10.1128/JCM.41.11.5134-5146.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Duplex Real-Time SYBR Green PCR Assays for Detection of 17 Species of Food- or Waterborne Pathogens in Stools

Hiroshi Fukushima,* Yoshie Tsunomori, and Ryotaro Seki

Shimane Prefectural Institute of Public Health and Environmental Science, Shimane 690-0122, Japan

Received 26 February 2003/ Returned for modification 8 April 2003/ Accepted 6 July 2003

A duplex real-time SYBR Green LightCycler PCR (LC-PCR) assay with DNA extraction using the QIAamp DNA Stool Mini kit was evaluated with regard to detection of 8 of 17 species of food- or waterborne pathogens in five stool specimens in 2 h or less. The protocol used the same LC-PCR with 20 pairs of specific primers. The products formed were identified based on a melting point temperature (Tm) curve analysis. The 17 species of food- or waterborne pathogens examined were enteroinvasive Escherichia coli, enteropathogenic E. coli, enterohemorrhagic E. coli, enterotoxigenic E. coli, enteroaggregative E. coli, Salmonella spp., Shigella spp., Yersinia enterocolitica, Yersinia pseudotuberculosis, Campylobacter jejuni, Vibrio cholerae, Vibrio parahaemolyticus, Vibrio vulnificus, Aeromonas spp., Staphylococcus aureus, Clostridium perfringens, and Bacillus cereus. No interference with the LC-PCR assay was observed when stool specimens were artificially inoculated with each bacterial species. The detection levels were approximately 105 food- or waterborne pathogenic bacteria per g of stool. The protocol for processing stool specimens for less than 104 food- or waterborne pathogenic bacteria per g of stool requires an overnight enrichment step to achieve adequate sensitivity. However, the rapid amplification and reliable detection of specific genes of greater than 105 food- or waterborne pathogenic bacteria per g in samples should facilitate the diagnosis and management of food- or waterborne outbreaks.

* Corresponding author. Mailing address: Shimane Prefectural Institute of Public Health and Environmental Science, 582 Nishihamasada, Matsue, Shimane 690-0122, Japan. Phone: 81-0852-36-8181. Fax: 81-0852-36-8356. E-mail: fukushima-hiroshi{at}pref.shimane.jp.

Journal of Clinical Microbiology, November 2003, p. 5134-5146, Vol. 41, No. 11
0095-1137/03/$08.00+0     DOI: 10.1128/JCM.41.11.5134-5146.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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