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• W2129742279 abstract "Real-time PCR assays, based on hybridisation probes and LightCycler technology, were developed for VT 1 and VT 2 genes and applied to the detection and quantitation of DNA and mRNA of Escherichia coli O157:H7. The qualitative consensus PCR assay for the detection of VT 1 and/or VT 2 genes had a detection limit of 100 fg of E. coli O157:H7 genomic DNA and did not detect DNA from 13 non-VTEC isolates. When E. coli O157:H7 was inoculated into minced beef, enriched and recovered by immunomagnetic separation, the real-time consensus PCR assay had a detection limit of log(10)3.5 ml(-1) E. coli O157:H7 cells. Nineteen E. coli O157:H7 isolates, derived from food, bovine samples and human faeces, were analysed and compared for mRNA expression of three genes, VT 1, VT 2 and gapA (housekeeping gene), using quantitative real-time PCR assays. While there was no statistically significant difference for the expression of the VT 1 (p=0.134) or VT 2 (p=0.52) mRNA in the E. coli O157:H7 isolates from food, bovine and human sources, three clinical isolates did show lower expression of VT 2 compared to other isolates in the study. The study indicates that the consensus qualitative real-time PCR assay for VT 1 and VT 2 is rapid and sensitive and that the quantitative assays reported here have the potential to be used as an alternative method to more conventional methods for studying VT 1 and VT 2 virulence gene expression in E. coli O157:H7 with potential application in other pathogenic E. coli species." @default.
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• W2129742279 date "2004-04-01" @default.
• W2129742279 modified "2023-10-01" @default.
• W2129742279 title "Application of real-time PCR and RT-PCR assays for the detection and quantitation of VT 1 and VT 2 toxin genes in E. coli O157:H7" @default.
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• W2129742279 doi "https://doi.org/10.1016/j.mcp.2003.10.004" @default.
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