ArticleApplied and environmental microbiology2007
Recurrent and sporadic Listeria monocytogenes contamination in alheiras represents considerable diversity, including virulence-attenuated isolates.
Article in Applied and environmental microbiology, 2007. The graph could read no effect estimate from its abstract, so it casts no vote on the map. An erratum has been issued. Cited by 22 papers.
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Who cites it
22 citing papers in PubMed.
- Premature stop codons inBioscience of microbiota, food and health · 2026Article
- Molecular Characterization of Virulence-Related Genes in Listeria monocytogenes Isolated from Retail Meats in Sapporo, Japan.Current microbiology · 2025Article
- Evaluation of the Virulence Potential ofInternational journal of molecular sciences · 2023Article
- A Comprehensive Virulence and Resistance Characteristics ofInternational journal of molecular sciences · 2023Article
- Genomic Surveillance of Listeria monocytogenes in Taiwan, 2014 to 2019.Microbiology spectrum · 2022Article
- Genetic characteristics and virulence of Listeria monocytogenes isolated from fresh vegetables in China.BMC microbiology · 2019Article
- Characterization of internalin genes inGut pathogens · 2019Article
- Occurrence, Antibiotic Resistance, and Population Diversity ofFrontiers in microbiology · 2018Article
- Genotypes Associated withFrontiers in microbiology · 2017Article
- Article
- Listeria monocytogenes associated with New Zealand seafood production and clinical cases: unique sequence types, truncated InlA, and attenuated invasiveness.Applied and environmental microbiology · 2014Article
- Examination of food chain-derived Listeria monocytogenes strains of different serotypes reveals considerable diversity in inlA genotypes, mutability, and adaptation to cold temperatures.Applied and environmental microbiology · 2013Article
- Diverse geno- and phenotypes of persistent Listeria monocytogenes isolates from fermented meat sausage production facilities in Portugal.Applied and environmental microbiology · 2011Article
- Significant shift in median guinea pig infectious dose shown by an outbreak-associated Listeria monocytogenes epidemic clone strain and a strain carrying a premature stop codon mutation in inlA.Applied and environmental microbiology · 2011Article
- Variation in Listeria monocytogenes dose responses in relation to subtypes encoding a full-length or truncated internalin A.Applied and environmental microbiology · 2011Article
- Real-time PCR assay to differentiate Listeriolysin S-positive and -negative strains of Listeria monocytogenes.Applied and environmental microbiology · 2011Article
- Revelation by single-nucleotide polymorphism genotyping that mutations leading to a premature stop codon in inlA are common among Listeria monocytogenes isolates from ready-to-eat foods but not human listeriosis cases.Applied and environmental microbiology · 2010Article
- Population diversity of Listeria monocytogenes LO28: phenotypic and genotypic characterization of variants resistant to high hydrostatic pressure.Applied and environmental microbiology · 2010Article
- Article
- Some Listeria monocytogenes outbreak strains demonstrate significantly reduced invasion, inlA transcript levels, and swarming motility in vitro.Applied and environmental microbiology · 2009Article
Corrections and comments
- Erratum issued
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5 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Microbiological characterization of alheiras, traditional smoked meat sausages produced in northern Portugal, had previously shown that more than 60% of the lots analyzed were contaminated with Listeria monocytogenes at levels higher than 100 CFU/g. In order to better understand L. monocytogenes contamination patterns in alheiras, we characterized 128 L. monocytogenes isolates from alheiras using a variety of subtyping techniques (i.e., molecular serotyping; arsenic, cadmium, and tetracycline resistance typing; and pulsed-field gel electrophoresis [PFGE]). Subtyping of isolates from products collected on two separate dates provided evidence for the persistence of specific L. monocytogenes PFGE types in the production and distribution chains of alheiras from four different processors. A subset of 21 isolates was further characterized using ribotyping and Caco-2 cell invasion assays to evaluate the pathogenic potential of L. monocytogenes present in alheiras. Caco-2 invasion assays revealed seven isolates with invasion efficiencies that were less than 20% of that of the control strain 10403S. All seven isolates had premature stop codons in inlA that represented three distinct mutations, which had previously been observed in isolates from the United States or France. Our findings indicate the need for a comprehensive approach to control L. monocytogenes in alheiras, including strategies to reduce persistence. The presence of considerable diversity in invasion phenotypes among L. monocytogenes strains present in alheiras, including the presence of subtypes likely to be virulence attenuated, may provide an opportunity to initially focus control strategies on the subtypes most likely to cause human disease.
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