Long-term survival of Shiga toxin-producing Escherichia coli in cattle effluents and environment: An updated review

Frémaux, B.; Prigent‐Combaret, Claire; Vernozy-Rozand, C.

doi:10.1016/j.vetmic.2008.05.015

Cited by 126 publications

(98 citation statements)

References 113 publications

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“…If environmental (i.e., edaphic) variation selects for persistent E. coli genotypes in soil, then the landscape genetic distribution in soil will change in response to edaphic gradients. The contribution of fecal deposition to E. coli spatial patterns must be examined in addition to edaphic variables, because deposition is the process that controls E. coli introduction into soil (14,21). Therefore, landscape genetic analysis of E. coli distributions can help to clarify how deposition in soil changes extrahost populations (7,14,39).…”

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confidence: 99%

“…The contribution of fecal deposition to E. coli spatial patterns must be examined in addition to edaphic variables, because deposition is the process that controls E. coli introduction into soil (14,21). Therefore, landscape genetic analysis of E. coli distributions can help to clarify how deposition in soil changes extrahost populations (7,14,39). For example, if E. coli populations in soil were found to be structured along a pH gradient, then soil pH might be a useful predictor for mapping fecal pollution risk or potential environmental reservoirs of fecal bacteria.…”

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confidence: 99%

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Environmental Patterns Are Imposed on the Population Structure of Escherichia coli after Fecal Deposition

Bergholz

Noar

Buckley

2011

Appl Environ Microbiol

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The intestinal microbe Escherichia coli is subject to fecal deposition in secondary habitats, where it persists transiently, allowing for the opportunity to colonize new hosts. Selection in the secondary habitat can be postulated, but its impact on the genomic diversity of E. coli is unknown. Environmental selective pressure on extrahost E. coli can be revealed by landscape genetic analysis, which examines the influences of dispersal processes, landscape features, and the environment on the spatiotemporal distribution of genes in natural populations. We conducted multilocus sequence analysis of 353 E. coli isolates from soil and fecal samples obtained in a recreational meadow to examine the ecological processes controlling their distributions. Soil isolates, as a group, were not genetically distinct from fecal isolates, with only 0.8% of genetic variation and no fixed mutations attributed to the isolate source. Analysis of the landscape genetic structure of E. coli populations showed a patchy spatial structure consistent with patterns of fecal deposition. Controlling for the spatial pattern made it possible to detect environmental gradients of pH, moisture, and organic matter corresponding to the genetic structure of E. coli in soil. Ecological distinctions among E. coli subpopulations (i.e., E. coli reference collection [ECOR] groups) contributed to variation in subpopulation distributions. Therefore, while fecal deposition is the major predictor of E. coli distributions on the field scale, selection imposed by the soil environment has a significant impact on E. coli population structure and potentially amplifies the occasional introduction of stress-tolerant strains to new host individuals by transmission through water or food.

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confidence: 99%

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confidence: 99%

Environmental Patterns Are Imposed on the Population Structure of Escherichia coli after Fecal Deposition

Bergholz

Noar

Buckley

2011

Appl Environ Microbiol

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“…[7][8][9], but since these reviews lack formally peer-reviewed and published protocols, these works lack the traceability of systematic reviews. Systematic review methods, therefore, offer a high degree of transparency and verifiability where an update is needed.…”

Section: Introductionmentioning

confidence: 99%

Updating and amending systematic reviews and systematic maps in environmental management

et al. 2016

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Systematic reviews and systematic maps aim to provide an overview of the best available evidence to inform research, policy and practice. However, like any form of review, they will require updating periodically to ensure that the most recent evidence has been incorporated. Here we outline two types of review revisions as recognised in medicine: updates and amendments. Updates involve a search for new studies, expanding the evidence base through time. Any other change (e.g. in screening or synthesis) or correction to the original report is an amendment. Decisions as to whether/when it is appropriate to undertake an update or amendment must be made on a case-bycase basis, considering issues such as the reliability and scope of the existing review or map, likely volume of new evidence, resources available, and the likely value of including new information. Careful, consistent reporting is necessary to ensure transparency and repeatability, particularly where there are deviations from the original methods, and authors should highlight key advances relative to the original report. Updating environmental systematic reviews and maps will be an increasingly important activity as the numbers of both primary studies and synthetic reports in the literature continue to grow.

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“…Those carrying and excreting STEC are most often asymptomatic whenever they host the bacteria in their digestive tract; hence they are called healthy carriers (12,15). Although STEC infection in human is a common cause of bloody diarrhoea in developed countries and causes many outbreaks, the incidence of this bacterial infection in North African countries such as Algeria is not clear and has not been well studied.…”

Section: Introductionmentioning

confidence: 99%

Prevalence of Asymptomatic Carriers of Shiga Toxin-Producing Escherichia Coli (STEC) in Dairy Cattle Farms in the Governorate of Blida (Algeria)

Baazize-Ammi

Gassem

Derrar

et al. 2015

Bulletin of the Veterinary Institute in Pulawy

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We investigated whether dairy beef cattle raised in Algeria are Shiga toxin-producing Escherichia coli (STEC) carriers. Stx1 and stx2 genes were analysed in DNA isolated from 200 faecal samples collected from adult dairy cows from 27 randomly selected farms in Blida, North Algeria, after amplification by PCR. Samples from 61 (30.5%) animals out of the 200 were positive and were located in 18 farms with a prevalence of 66.7%. Interestingly, no sample from any cow was positive for only the stx2 gene, while in contrast, samples from 51 cows were positive for the stx1 gene alone (83.6%) and those from 10 other cows were positive for both stx1 and stx2 genes (16.4%). It should be noted that the faecal samples infected with pathogens carrying the two genes originated from 4 out of the 18 farms that were found to be positive, with a rate of 22.2%.

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Long-term survival of Shiga toxin-producing Escherichia coli in cattle effluents and environment: An updated review

Cited by 126 publications

References 113 publications

Environmental Patterns Are Imposed on the Population Structure of Escherichia coli after Fecal Deposition

Environmental Patterns Are Imposed on the Population Structure of Escherichia coli after Fecal Deposition

Updating and amending systematic reviews and systematic maps in environmental management

Prevalence of Asymptomatic Carriers of Shiga Toxin-Producing Escherichia Coli (STEC) in Dairy Cattle Farms in the Governorate of Blida (Algeria)

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