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New Aspects on Listeria monocytogenes ST5-ECVI Predominance in a Heavily Contaminated Cheese Processing Environment

Overview of attention for article published in Frontiers in Microbiology, February 2018
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Title
New Aspects on Listeria monocytogenes ST5-ECVI Predominance in a Heavily Contaminated Cheese Processing Environment
Published in
Frontiers in Microbiology, February 2018
DOI 10.3389/fmicb.2018.00064
Pubmed ID
Authors

Meryem Muhterem-Uyar, Luminita Ciolacu, Karl-Heinz Wagner, Martin Wagner, Stephan Schmitz-Esser, Beatrix Stessl

Abstract

The eradication ofListeria monocytogenesfrom food chains is still a great challenge for the food industry and control authorities since some clonal complexes (CCs) are either better adapted to food processing environments (FPEs) or are globally widespread. In this work, we focus on the in-house evolution ofL. monocytogenesgenotypes collected from a heavily contaminated FPE whose contamination pattern underwent a massive and yet unexplained change. At the beginning of the sampling in 2010, a high variety of most likely transientL. monocytogenesgenotypes was detected belonging to sequence type (ST) 1, ST7, ST21, ST37. After several efforts to intensify the hygiene measures, the variability was reduced toL. monocytogenesST5 that was dominant in the following years 2011 and 2012. We aimed to elucidate possible genetic mechanisms responsible for the high abundance and persistence of ST5 strains in this FPE. Therefore, we compared the genomes of sixL. monocytogenesST5 strains to the less frequently occurring transientL. monocytogenesST37 and ST204 from the same FPE as well as the highly abundant ST1 and ST21 isolated in 2010. Whole genome analysis indicated a high degree of conservation among ST5 strains [average nucleotide identity (ANI) 99.93-99.99%; tetranucleotide correlation 0.99998-0.99999]. Slight differences in pulsed field gel electrophoresis (PFGE) patterns of two ST5 isolates could be explained by genetic changes in the tRNA-Arg-TCT prophages. ST5 and ST204 strains harbored virtually identical 91 kbp plasmids related to plasmid group 2 (pLM80 and pLMUCDL175). Interestingly, highly abundant genotypes present in the FPE in 2010 did not harbor any plasmids. The ST5 plasmids harbored an efflux pump system (bcrABCcassette) and heavy metal resistance genes possibly providing a higher tolerance to disinfectants. The pLM80 prototype plasmids most likely provide important genetic determinants for a better survival ofL. monocytogenesin the FPE. We reveal short-term evolution ofL. monocytogenesstrains within the same FPE over a 3 year period and our results suggest that plasmids are important for the persistence of ST5 strains in this FPE.

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Mendeley readers

Mendeley readers

The data shown below were compiled from readership statistics for 75 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country Count As %
Unknown 75 100%

Demographic breakdown

Readers by professional status Count As %
Student > Bachelor 12 16%
Student > Master 11 15%
Student > Ph. D. Student 11 15%
Researcher 10 13%
Other 3 4%
Other 5 7%
Unknown 23 31%
Readers by discipline Count As %
Agricultural and Biological Sciences 20 27%
Biochemistry, Genetics and Molecular Biology 7 9%
Immunology and Microbiology 5 7%
Veterinary Science and Veterinary Medicine 4 5%
Medicine and Dentistry 3 4%
Other 10 13%
Unknown 26 35%
Attention Score in Context

Attention Score in Context

This research output has an Altmetric Attention Score of 1. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 09 July 2018.
All research outputs
#18,641,800
of 23,094,276 outputs
Outputs from Frontiers in Microbiology
#19,668
of 25,264 outputs
Outputs of similar age
#329,974
of 440,423 outputs
Outputs of similar age from Frontiers in Microbiology
#440
of 539 outputs
Altmetric has tracked 23,094,276 research outputs across all sources so far. This one is in the 11th percentile – i.e., 11% of other outputs scored the same or lower than it.
So far Altmetric has tracked 25,264 research outputs from this source. They typically receive a little more attention than average, with a mean Attention Score of 6.4. This one is in the 9th percentile – i.e., 9% of its peers scored the same or lower than it.
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We're also able to compare this research output to 539 others from the same source and published within six weeks on either side of this one. This one is in the 7th percentile – i.e., 7% of its contemporaries scored the same or lower than it.