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    A case of bovine raw milk contamination with Listeria monocytogenes

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    Author
    Hunt, Karen
    Drummond, Niall
    Murphy, Mary
    Butler, Francis
    Buckley, James F.
    Jordan, Kieran
    Keyword
    Listeria monocytogenes
    Pulsed-field gel electrophoresis
    Contaminated milk
    Date
    06/07/2012
    
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    URI
    http://hdl.handle.net/11019/327
    Citation
    Hunt, Karen et al. A case of bovine raw milk contamination with Listeria monocytogenes. Irish Veterinary Journal, 2012, 65(1):13
    Abstract
    During routine sampling of bulk raw milk on a dairy farm, the pathogenic bacteria Listeria monocytogenes was found to be a contaminant, at numbers < 100 cfu/ml. A strain with an indistinguishable pulsed-field gel electrophoresis pattern was isolated from the bulk milk two months later. Environmental swabs taken at the dairy environment were negative for the presence of L. monocytogenes, indicating a possible case of excretion of the L. monocytogenes directly into the milk. Milk samples were collected from the individual cows and analysed, resulting in the identification of L. monocytogenes excretion (at 280 cfu/ml) from one of the 4 mammary quarters of one dairy cow out of 180. When the infected cow was isolated from the herd, no L. monocytogenes was detected from the remaining herd. The pulsed-field gel electrophoresis pattern of the strain from the individual cow was indistinguishable from that originally isolated from the bulk milk. The infected cow did not show any clinical signs of disease, nor did the appearance of the milk have any physical abnormalities. Antibiotic treatment of the infected mammary quarter was found to be ineffective. This study shows that there can be risks associated with direct contamination of raw milk with L. monocytogenes.
    Funder
    Teagasc Walsh Fellowship Programme; Department of Agriculture, Food and the Marine, Ireland; European Union
    ae974a485f413a2113503eed53cd6c53
    http://dx.doi.org/10.1186/2046-0481-65-13
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    Food Safety
    Teagasc publications in Biomed Central
    Teagasc publications in Biomed Central
    Food Quality & Sensory Science
    Animal & Bioscience

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