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Journal of Dairy Science Vol. 76 No. 10 2891-2898
© 1993 by American Dairy Science Association ®
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Risk Factors Associated with Contamination of Raw Milk by Listeria monocytogenes in Dairy Farms

M. Sanaa 1, B. Poutrel 1, J. L. Menard 1, and F. Serieys 1

1 Epidemiology and Animal Health Management Laboratory, Ecole Nationale Vétérinaire d'Alfort, 7, avenue du Général-de-Gaulle, 94704 Maisons-Alfort, France

A case-control study involving 128 selected dairy farms was conducted to assess the association of several suspected risk factors with the odds of contamination of raw milk by Listeria monocytogenes. Using logistic regression, we found that poor quality of silage (pH >4.0). inadequate frequency of cleaning the exercise area, poor cow cleanliness, insufficient lighting of milking barns and parlors, and incorrect disinfection of towels between milkings were significantly associated with milk contamination by L monocytogenes. More attention to preparing silage and good milking and barn hygiene are important for diminishing the risks of exogenous contamination of raw milk by L. monocytogenes.

Key Words: Listeria monocytogenes • raw milk • bacteriology quality

Submitted on November 24, 1992
Accepted on May 17, 1993




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Copyright © 1993 by the American Dairy Science Association ®.