https://www.ucipfg.com/Repositorio/MIA/MIA-07/Unidad_academica01/Control_of_L_monocytogenes.pdf

Control of Listeria monocytogenes in the Food-Processing Environment

Listeria monocytogenes and listeriosis: a review of hazard characterisation for use in microbiological risk assessment of foods.

Background. Internalin mediates entry of Listeria monocytogenes into some human cultured cell lines and crossing of the intestinal barrier in transgenic mice expressing its receptor, human E-cadherin, in enterocytes. The relevance of these findings for humans is challenged by the observation that some L. monocytogenes isolates express a truncated nonfunctional form of internalin. Methods. We investigated expression of internalin by use of immunoblot assay in 300 clinical strains obtained in France in a single year and a representative set of 150 strains obtained from food products during the same period. Results. Clinical strains expressed full-length internalin far more frequently (288/300 strains [96%]) than did strains recovered from food products (98/150 strains [65%]; odds ratio, 12.73; 95% confidence interval, 6.27-26.34; P< 1 × 10 -7 ). All 61 strains (100%) from pregnancy-related cases, 55 (98%) of 56 strains from patients with central nervous system infections, and 151 (93%) of 162 strains from patients with bacteremia expressed full-length internalin. All 110 strains belonging to serovar 4b, the most frequently implicated serovar in human listeriosis, expressed full-length internalin. Conclusions. This study demonstrates the critical role of internalin in the pathogenesis of human listeriosis. It provides a molecular explanation for the predominance of serovar 4b among clinical strains and supports the usefulness of studying the expression of internalin as a marker of virulence in humans.

/pdf/a-molecular-marker-for-evaluating-the-pathogenic-potential-2208j24qmc.pdf

A Molecular Marker for Evaluating the Pathogenic Potential of Foodborne Listeria monocytogenes

A multiplex PCR for species- and virulence-specific determination of Listeria monocytogenes.

A Listeria-like strain isolated in Austria from pre-cut lettuce fitted the description of the genus Listeria although it could not be assigned to any of the known species. Comparison of the rrs gene (encoding 16S rRNA) sequence and gene content by DNA-array indicated affiliation to the genus Listeria. Phylogenetic distance from known species of the genus Listeria indicated that it represents a novel species. Since it can be differentiated from all other known species of the genus Listeria by using phenotypic tests, the name Listeria rocourtiae sp. nov. is proposed for the novel species. The type strain is CIP 109804T (=DSM 22097T =Allerberger 700284/02T). The type strain is avirulent as assessed by cell culture assays and inoculation of mice.

/pdf/listeria-rocourtiae-sp-nov-4q65b64cyq.pdf

Listeria rocourtiae sp. nov.

Assessment of the virulence of Listeria monocytogenes: agreement between a plaque-forming assay with HT-29 cells and infection of immunocompetent mice

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Assessment of the virulence of Listeria monocytogenes: agreement between a plaque-forming assay with HT-29 cells and infection of immunocompetent mice