The fate of verocytotoxigenic Escherichia coli C600 φ 3538(Δvtx2::cat) and its vtx2prophage during grass silage preparation
Abstract
Silage is grass, preserved by fermentation and used as winter feed for cattle. The impact of a range of current grass silage preparation practices on the survival of Escherichia coli C600φ3538(Δvtx2::cat) and on the induction, release and infectivity of free phage were investigated. Wilted and fresh grass samples, from plots with and without slurry application, were ensiled with or without formic acid. Each treatment combination was inoculated with approximately 6 log10 CFU per g E. coli C600φ3538(Δvtx2::cat) (donor strain) and E. coli C600::kanamycinR (recipient strain) in test‐tube model silos and incubated in the dark at 15°C. The physico‐chemical (pH, ammonia, ethanol, lactic acid and volatile fatty acids) and microbiological (total viable counts, TVC, total Enterobacteriaceae counts, TEC, E. coli counts, ECC and lactic acid bacteria, LAB) properties of each fermentation were monitored throughout the experiment as were the concentrations of E. coli C600φ3538(Δvtx2::cat), E. coli C600::kanamycinR, free phage and transductants, using culture and PCR‐based methods. Over the course of the experiment the pH of the grass samples typically decreased by 2 pH units. TVC, TEC and ECC decreased by up to 2·3, 6·4 and 6·2 log10 CFU per g, respectively, while the LAB counts remained relatively stable at 5·2–7·1 log10 CFU per g. Both donor and recipient strains decreased by approximately 5 log10 CFU per g. Free phages were detected in all treatments and transductants were detected and confirmed by PCR in the silo containing wilted grass, pretreated with slurry and ensiled without formic acid. Verocytotoxigenic E. coli may survive the ensiling process and the conditions encountered are sufficient to induce vtx2 bacteriophage leading to low levels of phage‐mediated vtx2 gene transfer. These studies suggest that the ensiling of grass may create an environment which facilitates the emergence of new verocytotoxigenic E. coli.
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- Authors
- Nyambe, S., Burgess, C., Whyte, P., O'Kiely, P., & Bolton, D.
- Affiliations
- University College Dublin (IE)
- Food Safety Department; Food Research Centre; Dublin Ireland
- Teagasc Grange Research Centre; Dunsany Co. Meath Ireland
- Corresponding author
- Bolton, D.
- Venue
- Journal of Applied Microbiology
- Publisher
- Oxford University Press (OUP)
- Published
- 2017-04-04
- Volume
- 122
- Issue
- 5
- Pages
- 1197-1206
- ISSN
- 1364-5072 (ISSN-L)
- OpenAlex
- W2593276902
- Cited by
- 7
- References
- 31
- Citations by year
- 2026: 2 · 2024: 1 · 2021: 2 · 2019: 1 · 2017: 1
- FWCI
- 0.42
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- Journal of Applied Microbiology (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Department of Agriculture, Food and the Marine (11/F/051)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Endocrinology › Escherichia coli research studies
- Physical Sciences › Environmental Science › Ecology › Bacteriophages and microbial interactions
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Biotechnology › Listeria monocytogenes in Food Safety
- Keywords
- verocytotoxigenic Escherichia coli, bacteriophage induction, phage-mediated gene transfer, grass silage, silage fermentation, formic acid, slurry application, lactic acid bacteria, cattle feed, food safety
- MeSH terms
- Animals, Animal Feed, Cattle, Escherichia coli, Fatty Acids, Volatile, Fermentation, Food Handling, Formates, Poaceae, Hydrogen-Ion Concentration, Silage, Lactic Acid, Prophages
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