Research of Salmonella spp. and indicators microorganisms in poultry carcasses and chilling tanks water in poultry slaughterhouse.

摘要

The purpose of this work was to research the Salmonella spp. and indicators microorganisms (total coliforms-CT, thermotolerant coliforms-CTT, mesophilic aerobes-AM and psychotrophic microorganisms) in poultry carcasses and chilling tanks water in a poultry slaughterhouse in north of Parana, Brazil. 120 poultry carcasses (60 before the entrance in the chilling tank and 60 after the exit of the chilling tank) and 120 water samples (60 from pre-chiller tank and 60 from chiller tank) were analysed, with a total of 20 collections. The Brazilian legislation and PetrifilmTM AC were used in the analysis. Salmonella spp. was isolated in one poultry carcass before the entrance in the chilling tank and other after the exit of the chilling tank, both identified as Salmonella O8.20;z₄,z₂₃. In the water samples, six serovars were recognized in pre-chiller tank, five as Salmonella O8,20;z₄,z₂₃ and one S Tennessee. The means of TC on carcasses before the entrance and after the exit of the tanks and in the water samples from pre-chiller tank and in chiller were 3.74 MPN/g/3,10 MPN/g and 4.00 MPN/100 ml/2.81 MPN/100 ml respectively; the mean of TCC was 3.65 MPN/g/3.00 MPN/g and 3.81 MPN/100 ml/2.73 MPN/100 ml; the mean of MA was 6.40 CFU/g/5.60 CFU/g and 4.40 CFU/ml and 4.13 CFU/ml; the mean of MP was 4.21 CFU/g/3.66 CFU/g and. No significant difference was observed (p>0.05) in contamination index neither in poultry carcasses nor in tank water samples. It is possible to conclude that chilling tanks were not able to remove the microorganisms from the carcasses and could contribute to cross-contamination due to elevate water contamination.