Comparative Die-off of Escherichia coli 0157:H7 and Fecal Indicator Bacteria in Pond Water

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• 作者：Michael B. Jenkins ; Dwight S. Fisher ; Dinku M. Endale ; Paige Adams
• 刊名：Environmental Science & Technology
• 出版年：2011
• 出版时间：March 1, 2011
• 年：2011
• 卷：45
• 期：5
• 页码：1853-1858
• 全文大小：810K
• 年卷期：v.45,no.5(March 1, 2011)
• ISSN：1520-5851

文摘

In situ and in vitro experiments were performed to assess the effects of solar radiation and predation by indigenous microflora on the relative die-off rates of a toxigenic strain of Escherichia coli 0157:H7, commensal E. coli, and fecal enterococci in surface waters from ponds in agricultural watersheds. The objective of these experiments was to discern a mechanism of persistence of E. coli 0157:H7 in surface waters compared to fecal indicator bacteria. Results of these experiments indicated that E. coli and fecal enterococci were affected by both insolation and apparent predation; whereas E. coli 0157:H7 appeared to be resistant to both of these environmental stressors. The number of days to reach 99% die-off (T₉₉-values) for E. coli 0157:H7 was significantly greater than that for the indicator bacteria. The capacity to prolong die-off may be connected to the apparent persistence of E. coli 0157:H7 in surface waters.