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Reduction of Multidrug-Resistant and Drug-Susceptible Salmonella in Ground Beef and Freshly Harvested Beef Briskets after Exposure to Commonly Used Industry Antimicrobial Interventions

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Two separate studies were conducted to examine the differences in survivability of multidrug-resistant (MDR) and drugsusceptible Salmonella in fresh meats in a simulated industry environment. Beef trim from a commercial facility was inoculated with either MDR (AmpC phenotype) or drug-susceptible Salmonella (SUS) cocktails (106 CFU/ml). Antimicrobial interventions included 3% lactic acid (LA), 1,000 ppm of acidified sodium chloride (ASC), ambient water (AW), and an inoculated control with no intervention (CTRL). Each aliquot was ground and formed into patties and packaged using high-O2 modified atmosphere packaging. Samples for microbiological evaluation were collected on days 0, 7, 10, and 14. In the second study, beef briskets were collected immediately after harvest. Inoculation and antimicrobial application were the same, except treatments were heated and there was an additional hot water treatment. All beef briskets were refrigerated, and samples were collected at 0, 6, and 24 h. For the first study, the overall effectiveness of the treatments (from most effective to least effective) was LA, ASC, CTRL, and AW. Significant differences were observed only between MDR and SUS Salmonella when AW was applied (P = 0.02), and bacterial loads with AW were significantly greater (P < 0.01) for MDR Salmonella. In the second study, the intervention effectiveness ranked LA, ASC, hot water, AW, and CTRL. Significant differences between MDR and SUS Salmonella levels were not detected for any intervention or sampling time point. These data indicate that MDR and SUS variants of Salmonella behave similarly in response to the antagonistic action of antimicrobials commonly used in beef facilities.

Document Type: Research Article

Affiliations: 1: Department of Animal and Food Sciences, International Center for Food Industry Excellence, Texas Tech University, Box 42141, Lubbock, Texas 79409 2: Department of Biological Sciences, Texas Tech University, Box 43131, Lubbock, Texas 79409 3: Department of Agricultural Sciences, West Texas A&M University, Box 60998, Canyon, Texas 79016, USA 4: Department of Animal and Food Sciences, International Center for Food Industry Excellence, Texas Tech University, Box 42141, Lubbock, Texas 79409;, Email:

Publication date: July 1, 2010

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    The Journal of Food Protection (JFP) is a refereed monthly publication. Each issue contains scientific research and authoritative review articles reporting on a variety of topics in food science pertaining to food safety and quality. The Journal is internationally recognized as the leading publication in the field of food microbiology with a readership exceeding 11,000 scientists from 70 countries. The Journal of Food Protection is indexed in Index Medicus, Current Contents, BIOSIS, PubMed, Medline, and many others.

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