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Environ Sci Technol. 2011 Mar 1;45(5):1853-8. doi: 10.1021/es1032019. Epub 2011 Feb 9.

Comparative die-off of Escherichia coli O157:H7 and fecal indicator bacteria in pond water.

Author information

1
USDA Agriculture Research Service, J Phil Campbell, Sr Natural Resource Conservation Center, Watkinsville, Georgia 30677, USA. michael.jenkins@ars.usda.gov

Abstract

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 O157: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 O157: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 O157:H7 appeared to be resistant to both of these environmental stressors. The number of days to reach 99% die-off (T(99)-values) for E. coli O157: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 O157:H7 in surface waters.

PMID:
21306148
DOI:
10.1021/es1032019
[Indexed for MEDLINE]

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