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- W2476677770 abstract "The relationship between culturable counts (CFU) and quantitative PCR (qPCR) cell equivalent counts of Escherichia coli in dairy feces exposed to different environmental conditions and temperature extremes was investigated. Fecal samples were collected in summer and winter from dairy cowpats held under two treatments: field-exposed versus polytunnel-protected. A significant correlation in quantified E. coli was recorded between the qPCR and culture-based methods (r = 0.82). Evaluation of the persistence profiles of E. coli over time revealed no significant difference in the E. coli numbers determined as either CFU or gene copies during the summer for the field-exposed cowpats, whereas significantly higher counts were observed by qPCR for the polytunnel-protected cowpats, which were exposed to higher ambient temperatures. In winter, the qPCR returned significantly higher counts of E. coli for the field-exposed cowpats, thus representing a reversal of the findings from the summer sampling campaign. Results from this study suggest that with increasing time post-defecation and with the onset of challenging environmental conditions, such as extremes in temperature, culture-based counts begin to underestimate the true resilience of viable E. coli populations in livestock feces. This is important not only in the long term as the Earth changes in response to climate-change drivers but also in the short term during spells of extremely cold or hot weather." @default.
- W2476677770 created "2016-08-23" @default.
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- W2476677770 date "2016-08-08" @default.
- W2476677770 modified "2023-10-11" @default.
- W2476677770 title "Quantitative PCR Profiling of <i>Escherichia coli</i> in Livestock Feces Reveals Increased Population Resilience Relative to Culturable Counts under Temperature Extremes" @default.
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- W2476677770 doi "https://doi.org/10.1021/acs.est.6b02657" @default.
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