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Development of a multiplex real-time polymerase chain reaction for simultaneous detection of enterohemorrhagic Escherichia coli and enteropathogenic Escherichia coli strains


Development of a multiplex real-time polymerase chain reaction for simultaneous detection of enterohemorrhagic Escherichia coli and enteropathogenic Escherichia coli strains



Foodborne Pathogens and Disease 7(7): 801-808



ISSN/ISBN: 1535-3141

PMID: 20156086

DOI: 10.1089/fpd.2009.0457

A multiplex real-time polymerase chain reaction (PCR) was developed for the simultaneous detection of genes encoding intimin (eae) and all variants of Shiga toxins 1 and 2 (stx1 and stx2) in diagnostic samples. The uidA gene encoding a beta-glucuronidase specific for Escherichia coli and Shigella spp. was included in the multiplex PCR assay as an internal amplification control. The multiplex PCR was tested on 30 E. coli reference strains and 174 diagnostic samples already characterized as harboring stx1, stx2, and eae genes. The multiplex PCR correctly detected the genes in all strains examined. No cross reaction was observed with 68 strains representing other gastrointestinal pathogens, normal gastrointestinal flora, or closely related bacteria, reflecting 100% specificity of the assay. The detection limits of the multiplex PCR were 5 genome equivalents for stx2 and 50 genome equivalents for eae and stx1.

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Accession: 052554058

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