Reduction of Salmonella on Inoculated Broilers

2 Abstract: The USDA has strict regulations regarding the incidence of Salmonella on post-chill poultry. The poultry industry is encouraged to use USDA-approved methods for controlling Salmonella and other potential pathogens on processed poultry. Thus, the objective of this study was to determine the antimicrobial effects of a post-chill Precure™ (Safe Foods Corporation, N. Little Rock, AR) treatment (pH = 1.5) on the levels of Salmonella on broiler carcasses. Precure™ is listed as a solution of GRAS acids for use by FDA and is listed as a safe and suitable ingredient by USDA for use on pou ltry. In this study, broiler carcasses (n=30) were obtained from a local USDA-inspected poultry processing facility and were transported on ice to MCA Services (Rogers, AR). Immediately upon arrival at th e laboratory, all carcasses were individually inoculated with approximately 350 cells of Salmonella to assure that all carcasses in the study would be contaminated with Salmonella. The Salmonella culture was enumerated the day prior to the study to determine the approximate number of cells that would be inoculated onto the surface of each carcass. After inoculation, the carcasses were allowed to sit undisturbed for 30 minutes to allow for bacterial attachment. The 30 carcasses were then randomly divided into two groups. Fifteen of the carcasses were used as a control and were not treated. The remaining 15 carcasses were subjected to a room temperature 30-second dip in Precure™ (pH = 1.5) followed by a 30-second drip period. All carcasses were individually bagged in sterile poultry rinse bags and were held at 40 F for 4 hours. Carcasses were then subjected to a whole carcass rinse in accordance with USDA/FSIS o standard laboratory procedures in Butterfield's Phosphate Diluent. The resulting rinse fluid was microbiologically evaluated using Aerobic Plate Count Petrifilm™ for enumeration (colony forming units per mL) and the BAX System 3 ®4 PCR assay for presence or absence of Salmonella. As would be expected, all carcasses (100%) were positive for Salmonella in the control group while in the Precure™-treated group only 40% of the carcasses were Salmonella positive. The average level of total organisms using Petrifilm™ was 2.6 logs for the control group and 1.3 logs for the Precure™-treated group (95% reduction). It should be noted that Petrifilm™ would not only recover the inoculated Salmonella culture but also any indigenous organisms that may have been present. Results from this study demonstrate that the commercially available Precure™ (pH = 1.5) solution can be used as a post-chill treatment to control the incidence and levels of Salmonella and other naturally occurring microorganisms on broiler carcasses.