Role of rpoS in acid resistance and fecal shedding of Escherichia coli 0157:H7

Article Abstract:

Results show that glucose-repressed system is regulated by rpoS and the latter plays a role in the passage and shedding of Escherichia coli 0157:H4. Data indicate that this may lead to some resistance to gastrointestinal acid stress.

United States, Statistical Data Included, Environmental aspects, Feces, Microbiology, Cattle, Acid rain, Acid deposition, Diseases and pests

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Acid resistance systems required for survival of Escherichia coli O157:H7 in the bovine gastrointestinal tract and in apple cider are different

Article Abstract:

The examination of acid resistance (AR) in Escherichia coli O157:H7 by selectively removing the three determinants of AR is presented. The results indicate that E. coli O157:H7 utilizes different AR systems based on the type of acidic environment encountered.

Science & research, Acidity function

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Lethality of a heat- and phosphate-catalyzed glucose by-product to Escherichia coli O157:H7 and partial protection conferred by the rpoS regulon

Article Abstract:

A by-product of glucose produced during sterilization at neutral acidity and in the presence of phosphate was bactericidal to Escherichia coli O157:H7. Other six-carbon and five-carbon reducing sugars also produced a toxic by-product under the same conditions. Growth in glucose-free medium did not alleviate the sensitivity to the glucose-phosphate by-product and excludes the possibility of substrate-accelerated death as the cause of the bactericidal effect.

Antibacterial agents, Phosphates, Glucose

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