Low Prevalence of Listeria monocytogenes in Cull Sows and Pork

Authors: Wesley, Irene V.1; Larsen, Steven2; Hurd, H. Scott3; McKean, James D.3; Griffith, Ronald3; Rivera, Fernando4; Nannapaneni, Ramakrishna5; Cox, Mandy5; Johnson, Michael5; Wagner, Dean6; de Martino, Mary7

Source: Journal of Food Protection®, Volume 71, Number 3, March 2008 , pp. 545-549(5)

Publisher: International Association for Food Protection

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Abstract:

The goal of this study was to determine the prevalence of Listeria monocytogenes in sows slaughtered at a single Midwestern plant on two occasions (trial 1, n = 179 sows; trial 2, n = 160 sows). Fecal samples collected antemortem (trial 1) as well as animal tissues, and carcass swabs collected at the abattoir (trials 1 and 2) were analyzed. Eight isolates of L. monocytogenes were recovered from five samples that represented 0.18% of the total samples (n = 2,775). In trial 1, L. monocytogenes was detected in a tonsil sample (0.6%; 1 positive of 181 tonsils), in a carcass (0.6%; 1 positive of 179 carcasses), which was sampled prior to the organic rinse, and in two chopped meat block samples (1.2%; 2 positive of 165 samples). In trial 2, L. monocytogenes was only detected in a single chopped meat block sample (0.15%; 1 positive of 688 total samples). These data indicate the low prevalence of L. monocytogenes in the cull sow.

Document Type: Research article

Affiliations: 1: U.S. Department of Agriculture-Agricultural Research Service-National Animal Disease Center, Ames, Iowa 50010, USA 2: National Pork Board, Des Moines, Iowa 50306, USA 3: College of Veterinary Medicine, Iowa State University, Ames, Iowa 50011, USA 4: College of Veterinary Medicine, University of Zuila, Maracaibo 4002-a, Venezuela 5: Food Science Department, University of Arkansas, Fayetteville, Arkansas 72701, USA 6: Minnesota Department of Agriculture, St. Paul, Minnesota 55107, USA 7: University Hygienics Laboratory, University of Iowa, Iowa City, Iowa 52242, USA

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