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Risk assessment of Listeria monocytogenes in ready-to-eat foods. Technical report. Microbiological Risk Assessment Series (MRA) 5













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    Book (series)
    Risk assessment of Listeria monocytogenes in ready-to-eat foods. Interpretative Summary. Microbiological Risk Assessment Series (MRA) 4 2004
    Listeria monocytogenes is widely dispersed in the environment and foods, and is capable of growing even at refrigeration temperatures. Foodborne listeriosis, although relatively rare, is a clinically serious disease with a high case-fatality rate that largely affects specific higher-risk segments of the population. Cases of listeriosis appear to be predominately associated with ready-to-eat products. FAO and WHO have undertaken a risk assessment to addresses the risk of listeriosis associated with such foods and to answer specific risk management questions posed by the Codex Committee on Food Hygiene (CCFH). This volume provides a summary of that risk assessment. The interpretative summary includes an overview of the risk assessment with a particular focus on information that would be relevant to risk managers faced with addressing problems posed by this pathogen in ready-to-eat foods. It includes answers to the specific risk management questions posed by the CCFH and outlines the issues to be considered when implementing control measures, including the establishment of microbiological criteria. This volume and others in this Microbiological Risk Assessment Series contain information that is useful to both risk assessors and risk managers, the Codex Alimentarius Commission, governments and food regulatory agencies, industries and other people or institutions with an interest in the area of Listeria monocytogenes, its impact on public health and food trade, and th e use of microbiological risk assessment in control strategies.
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    Case study: Listeria monocytogenes in smoked fish
    Background paper for the Joint FAO/WHO expert consultation on the development of risk management strategies based on microbiological risk assessment outputs - Kiel, Germany, 3-7 April 2006
    2006
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    Listeria monocytogenes is a gram positive, facultatively anaerobic, psychrotrophic bacterial species that is capable of causing life-threatening septicaemia and meningitis in adult humans, and infections in foetuses and neonates that can lead to spontaneous abortions, foetal death, and septicaemia. This is typically a disease of specific high risk subpopulations with depressed or altered immune responses due to age, pregnancy, medical interventions, or chronic, immunosuppressive diseases (e.g., diabetes, HIV infections). In the past 20 years it has been established that the primary route of transmission for this pathogenic microorganism is food, with ready-to-eat foods that support the growth of the bacterium representing the greatest risk to the consumer; i.e., foods with high levels of L. monocytogenes are much more likely to cause listeriosis than low levels.
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    Listeria monocytogenes in ready-to-eat (RTE) foods: attribution, characterization and monitoring
    Meeting report
    2022
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    Since the publication of the 2004 risk assessment, outbreaks of illness and resultant deaths due to L. monocytogenes continue to occur across the globe. Continued effort is needed to summarize and critically evaluate the most recent information on L. monocytogenes in RTE foods. New data to improve and further inform the 2004 Risk Assessment is available for nearly every factor considered previously, including new quantitative data on L. monocytogenes contamination of foods. To facilitate this work, an FAO/WHO expert meeting was held by virtual means from 20 October to 6 November 2020 to review and discuss the available data and background documents, and to assess the need to modify and update risk assessment models/tools. This report focuses on the deliberations and conclusions of the expert meeting.

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