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    A nationwide surveillance study on E.coli 0157:H7 and enterobacteriaceae in Irish minced beef products

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    Author
    Duffy, Geraldine
    Cagney, Claire
    Crowley, Helen
    Sheridan, James J.
    Keyword
    E.coli
    Escherichia coli 0157:H7
    Beef
    Minced beef
    Beef burgers
    Enterobacteriaceae
    Irish beef
    Date
    2003-04
    
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    URI
    http://hdl.handle.net/11019/148
    Citation
    A nationwide surveillance study on E.coli 0157:H7 and enterobacteriaceae in Irish minced beef products. The National Food Centre Research Report No. 63. Geraldine Duffy et al. Dublin; Teagasc, 2003. ISBN 1841703389
    Abstract
    A surveillance study on prevalence and numbers of E . coli O157: H7 in minced beef (unpackaged or packaged) and beefburgers (frozen, fresh and unpackaged or packaged) was carried out over a period of 12 months in the Republic of Ireland. A total of 1533 products were tested with approximately 15 products collected from each of the 26 counties every 3 months. Mince and beefburgers were collected from both supermarkets and butcher shop outlets. A standard analysis was conducted by sample enrichment, IMS extraction and plating onto SMAC agar with confirmation by PCR. The results showed that 43 retail beef products (2.8 %) contained E .coli O157:H7. The number of E .coli O157: H7 in 21 of these samples ranged from log100.51 - 4.03 cfu g-1 ( i.e. 3 to 10,700 bacteria per gram) while in the remaining 22 the pathogen was detectable by enrichment only. There was a seasonal effect observed with 33 of 43 positive samples detected in January (n = 8), April /May(n=20) and August (n=5) and the remaining 10 positive samples detected over the other 8 months. Of the beef products testing positive, 32 were purchased from supermarkets and 11 from butcher shops. E .coli O157:H7 was recovered from 2.8% (13 / 457) of fresh packaged mince and from 1.88 % (3 / 160) of fresh unpackaged burgers purchased from butcher shops. Of the 43 isolates recovered, 41 contained the virulence genes v t1, v t2, E aeA and H lyA while the remaining 2 isolates contained only one of the vtproducing genes (v t1or v t2).
    Funder
    Food Safety Authority of Ireland
    Collections
    Food Safety
    Food Safety
    Food Chemistry & Technology
    Food Programme End of Project Reports

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