Influence of methodology on the recovery of salmonella from retail chicken
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Two experiments were conducted to determine the influence of methodology on the recovery of Salmonella on retail chicken. The first experiment was designed to determine if there was a difference in the incidence of Salmonella-positive carcasses reported by USDA-FSIS and the incidence of Salmonella-positive carcasses at the retail level using an exhaustive procedure. The second experiment was conducted to determine the effects of sampling methodology on the recovery of Salmonella from whole carcasses. In the first study 85 of the 251, or 33.9 %, of the retail carcasses were Salmonellapositive. This is higher than both the 20 % from the 1994-1995 baseline and the 10.4 % reported by USDA-FSIS in 1998. The incidence determined in the first study may have been higher due to methodology, different sampling location (retail level versus processing plant), post-process contamination, or the presence of giblets. In the second study the significantly more (p<0.0001) carcasses were found Salmonellapositive using whole carcass enrichment method than using the 30ml aliquot method recommended by USDA-FSIS. Also the incidence of Salmonella-positive carcasses determined by the whole carcass enrichment method (38 %) is comparable to the incidence determined in the first experiment (33.9 %), and the incidence determined by the Aliquot method (13%) was comparable to the incidence reported by USDA-FSIS in 1998 (10.4 %). Thus showing methodology does have an effect on Salmonella recovery when low numbers of Salmonella per carcass are expected.