Listeria monocytogenes (Lm) is the causative agent of listeriosis, an invasive disease primarily affecting immunocompromised people, the elderly, children and pregnant women, with high hospitalization (98.6%) and fatality rates (13.8%) 1. The disease is most commonly caused by eating contaminated food, in particular ready-to-eat. The ability of some strains to persist, even for years, in food processing environments can increase the risk of food contamination. Persistence can results from Lm survival after disinfection, thanks to protective biofilm formation, disinfectants and stresses resistance mechanisms or from the repeated reintroduction from raw materials 2 3. The identification of recurring highly genetically related isolates (Whole Genome Sequencing, WGS and core genome MLST, cgMLST) is necessary to define a strain persistent in a plant 4. The aim of this study was to evaluate persistence and resistance to commercial sanitizers commonly used in food processing environments, in Lm strains isolated within the laboratory activity of IZSUM (Istituto Zooprofilattico Sperimentale Umbria e Marche). Our approach was based on both WGS and in vitro assays.

Listeria monocytogenes persistence in food processing environments: Whole Genome Sequencing and in vitro assessment of disinfectants resistance and biofilm forming ability

GUIDI FABRIZIA;SCHIAVANO GIUDITTA;AMAGLIANI GIULIA;BRANDI GIORGIO
2019-01-01

Abstract

Listeria monocytogenes (Lm) is the causative agent of listeriosis, an invasive disease primarily affecting immunocompromised people, the elderly, children and pregnant women, with high hospitalization (98.6%) and fatality rates (13.8%) 1. The disease is most commonly caused by eating contaminated food, in particular ready-to-eat. The ability of some strains to persist, even for years, in food processing environments can increase the risk of food contamination. Persistence can results from Lm survival after disinfection, thanks to protective biofilm formation, disinfectants and stresses resistance mechanisms or from the repeated reintroduction from raw materials 2 3. The identification of recurring highly genetically related isolates (Whole Genome Sequencing, WGS and core genome MLST, cgMLST) is necessary to define a strain persistent in a plant 4. The aim of this study was to evaluate persistence and resistance to commercial sanitizers commonly used in food processing environments, in Lm strains isolated within the laboratory activity of IZSUM (Istituto Zooprofilattico Sperimentale Umbria e Marche). Our approach was based on both WGS and in vitro assays.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11576/2674012
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