| Factors influencing the persistence of Escherichia coli O157:H7 lineages in feces from cattle fed grain versus grass hay diets. | |
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MedLine Citation:
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PMID: 20725129 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Escherichia coli O157:H7 is a pathogenic, gram-negative bacterium that causes diarrhea, hemorrhagic colitis, and can lead to fatal hemolytic uremic syndrome in humans. We examined the persistence of E. coli O157:H7 lineages I and II in feces held at 4, 12, and 25 degrees C, from animals fed either grain or hay diets. Three strains of each lineage I and II were inoculated into grain-fed or hay-fed feces, and their persistence was monitored over 28 days. No significant differences in E. coli O157:H7 survival between the 2 lineages in both fecal types was found at the examined temperatures. Volatile fatty acids were higher in grain-fed than in hay-fed feces, resulting in consistently lower pH in the grain-fed feces at 4, 12 and 25 degrees C. Regardless of lineage type, E. coli O157:H7 CFUs were significantly higher in grain-fed than in hay-fed feces at 4 and 25 degrees C. Escherichia coli O157:H7 survival was highest in grain-fed feces at 25 degrees C up to 14 days. Our results indicate that the 2 lineages of E. coli O157:H7 do not differ in their persistence; however, it appears that temperature and feces type both affect the survival of the pathogen. |
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Authors:
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Ross M S Lowe; Krysty Munns; L Brent Selinger; Linda Kremenik; Danica Baines; Tim A McAllister; Ranjana Sharma |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Canadian journal of microbiology Volume: 56 ISSN: 1480-3275 ISO Abbreviation: Can. J. Microbiol. Publication Date: 2010 Aug |
Date Detail:
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Created Date: 2010-08-20 Completed Date: 2010-12-14 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0372707 Medline TA: Can J Microbiol Country: Canada |
Other Details:
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Languages: eng Pagination: 667-75 Citation Subset: IM |
Affiliation:
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Agriculture and Agri-Food Research Centre, P.O. Box 3000, Lethbridge, AB T1J 4B1, Canada. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animal Feed Animal Nutritional Physiological Phenomena Animals Bacterial Shedding Cattle / microbiology* Cattle Diseases / microbiology Cereals / chemistry Diarrhea / microbiology Diet / veterinary* Escherichia coli Infections / veterinary* Escherichia coli O157 / isolation & purification, pathogenicity* Fatty Acids, Volatile / analysis Feces / chemistry, microbiology* Poaceae / chemistry Zea mays / chemistry |
| Chemical | |
Reg. No./Substance:
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0/Fatty Acids, Volatile |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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