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Applied and Environmental Microbiology, December 1998, p. 4658-4662, Vol. 64, No. 12
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Effects of Starvation on Physiological Activity and Chlorine Disinfection Resistance in Escherichia coli O157:H7

John T. Lisle,1 Susan C. Broadaway,1 Annette M. Prescott,2 Barry H. Pyle,1 Colin Fricker,2 and Gordon A. McFeters1,*

Department of Microbiology, Montana State University, Bozeman, Montana 59717,1 and Thames Water Utility, Reading RG2 0JN, United Kingdom2

Received 23 April 1998/Accepted 14 September 1998

Escherichia coli O157:H7 can persist for days to weeks in microcosms simulating natural conditions. In this study, we used a suite of fluorescent, in situ stains and probes to assess the influence of starvation on physiological activity based on membrane potential (rhodamine 123 assay), membrane integrity (LIVE/DEAD BacLight kit), respiratory activity (5-cyano-2,3-di-4-tolyl-tetrazolium chloride assay), intracellular esterase activity (ScanRDI assay), and 16S rRNA content. Growth-dependent assays were also used to assess substrate responsiveness (direct viable count [DVC] assay), ATP activity (MicroStar assay), and culturability (R2A agar assay). In addition, resistance to chlorine disinfection was assessed. After 14 days of starvation, the DVC values decreased, while the values in all other assays remained relatively constant and equivalent to each other. Chlorine resistance progressively increased through the starvation period. After 29 days of starvation, there was no significant difference in chlorine resistance between control cultures that had not been exposed to the disinfectant and cultures that had been exposed. This study demonstrates that E. coli O157:H7 adapts to starvation conditions by developing a chlorine resistance phenotype.

* Corresponding author. Mailing address: Department of Microbiology, 109 Lewis Hall, Montana State University, Bozeman, MT 59717. Phone: (406) 994-5663. Fax: (406) 994-4926. E-mail: umbgm{at}montana.edu.

Applied and Environmental Microbiology, December 1998, p. 4658-4662, Vol. 64, No. 12
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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