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Risk Factors Associated with the Presence of Viable Listeria monocytogenes in Bulk Tank Milk from US Dairies

Permanent URL:
http://handle.nal.usda.gov/10113/27238
File:
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Abstract:
The objective of the study was to screen a large number of herd management practices and herd characteristics from US dairies to identify herd-level risk factors associated with the presence of Listeria monocytogenes in bulk tank milk (BTM). A total of 71 variables was univariately evaluated for their association with the presence of L. monocytogenes in BTM. Results from the univariate analysis indicated that using automatic take offs and having an open herd management increased the risk of BTM contamination with L. monocytogenes, while storing manure in outside pens not accessible to cattle decreased the risk. These variables, however, were not sustained in the multivariable model, which indicated that the presence of L. monocytogenes in BTM was significantly associated with region of the country (farms in the southeast and northeast were six and four times more likely respectively, to have BTM contamination than farms in the west) and number of milking cows (herds with >500 milking cows were five times more likely to have BTM contamination than herds with <100 milking cows). In conclusion, our results suggest that risk factors associated with BTM contamination are different depending on the geographical region and herd size of the operation.
Author(s):
Antognoli, M.C. , Lombard, J.E. , Wagner, B.A. , McCluskey, B.J. , Van Kessel, J.S. , Karns, J.S.
Subject(s):
dairy cows , cattle diseases , listeriosis , Listeria monocytogenes , food pathogens , zoonoses , bacterial contamination , disease transmission , human food chain , raw milk , bulk milk , milk tanks , food contamination , risk factors , epidemiological studies , national surveys , dairy herd management , herd size , farm size , animal manure management , geographical variation , multivariate analysis , United States
Format:
p. 77-83.
Note:
Includes references
Source:
Zoonoses and public health 2009 Mar., v. 56, no. 2
Language:
English
Publisher:
Oxford, UK : Blackwell Publishing Ltd
Year:
2009
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
Rights:
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.