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Related Experiment Videos

[Listeria monocytogenes in pasteurized milk].

J F Fernández Garayzábal, L Domínguez Rodríguez, J A Vázquez Boland

    Canadian Journal of Microbiology
    |February 1, 1986
    PubMed
    Summary

    Pathogenic Listeria monocytogenes strains were found in 21.4% of pasteurized milk samples in Madrid. This highlights pasteurized milk as a potential source of human listeriosis outbreaks.

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    Area of Science:

    • Food microbiology
    • Bacteriology
    • Public health

    Context:

    • Pasteurized milk is a widely consumed product.
    • Listeria monocytogenes is a significant foodborne pathogen.
    • Previous studies have indicated potential contamination of dairy products.

    Purpose:

    • To investigate the prevalence of Listeria species, including pathogenic strains, in pasteurized milk from a Madrid processing plant.
    • To assess the risk of Listeria contamination in pasteurized milk.

    Summary:

    • A study isolated an haemolytic Listeria monocytogenes strain pathogenic to mice from 6 out of 28 (21.4%) pasteurized milk samples.
    • Listeria grayi was the most frequently detected species (89.2%), followed by L. innocua (10.7%).
    • Other Listeria species, including L. welshimeri, were also identified, but L. ivanovii, L. seeligeri, L. murrayi, and L. denitrificans were not found.

    Impact:

    • Demonstrates that pathogenic Listeria strains can survive pasteurization and be present in milk.
    • Reinforces the hypothesis that pasteurized milk is a potential vehicle for human listeriosis transmission.
    • Underscores the importance of stringent quality control in milk processing to ensure food safety.

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