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- W2011115118 abstract "ABSTRACT Due to metabolic and morphological changes that can prevent Helicobacter pylori cells in water from growing on conventional media, an H. pylori -specific TaqMan quantitative PCR (qPCR) assay was developed that uses a 6-carboxyfluorescein-labeled probe (A. E. McDaniels, L. Wymer, C. Rankin, and R. Haugland, Water Res. 39:4808-4816, 2005). However, proper internal controls are needed to provide an accurate estimate of low numbers of H. pylori in drinking water. In this study, the 135-bp amplicon described by McDaniels et al. was modified at the probe binding region, using PCR mutagenesis. The fragment was incorporated into a single-copy plasmid to serve as a PCR-positive control and cloned into Escherichia coli to serve as a matrix spike. It was shown to have a detection limit of five copies, using a VIC dye-labeled probe. A DNA extraction kit was optimized that allowed sampling of an entire liter of water. Water samples spiked with the recombinant E. coli cells were shown to behave like H. pylori cells in the qPCR assay. The recombinant E. coli cells were optimized to be used at 10 cells/liter of water, where they were shown not to compete with 5 to 3,000 cells of H. pylori in a duplex qPCR assay. Four treated drinking water samples spiked with H. pylori (100 cells) demonstrated similar cycle threshold values if the chlorine disinfectant was first neutralized by sodium thiosulfate." @default.
- W2011115118 created "2016-06-24" @default.
- W2011115118 creator A5075193295 @default.
- W2011115118 creator A5086758144 @default.
- W2011115118 creator A5089770838 @default.
- W2011115118 date "2007-11-15" @default.
- W2011115118 modified "2023-09-23" @default.
- W2011115118 title "Development of an Internal Control for Evaluation and Standardization of a Quantitative PCR Assay for Detection of <i>Helicobacter pylori</i> in Drinking Water" @default.
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- W2011115118 doi "https://doi.org/10.1128/aem.00687-07" @default.
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