Calidad higiénico-sanitaria en plantas de faena de la provincia de Tucumán: Detección, aislamiento y caracterización de Escherichia coli productor de toxina Shiga / Hygienic-sanitary quality in abattoirs from Tucuman province, Argentina: Detection, isolation and characterization of Shiga toxin-producing Escherichia coli

Los bovinos son el principal reservorio de Escherichia coli productor de toxina Shiga (STEC); las estrategias para evitar su transmisión se concentran en la planta de faena. El objetivo de este trabajo fue evaluar la calidad higiénico-sanitaria y la frecuencia de detección de STEC en medias reses bovinas de frigoríficos de tránsito provincial. Se procesaron 274 esponjados de media res; en 9 (3,3%) el recuento de E. coli genérico fue marginal, en 4 (1,4%) se aisló E. coli O157, de los cuales 2 fueron caracterizados como stx2c(vh-a)/eae/ehxA, y los otros 2 como no toxigénicos. A partir de una (0,4%) muestra se aisló E. coli no-O157 ONT:H49, stx2a/ehxA/saa. En este trabajo la calidad del producto analizado indica que en la provincia de Tucumán se cumplen las buenas prácticas de manufactura en la faena de bovinos.

Cattle are the main reservoir of Shiga toxin-producing Escherichia coli (STEC), and the strategies to prevent the transmission of these microorganisms are concentrated in the slaughtering plant. The aim of this study was to evaluate the hygienic-sanitary quality and the frequency of detection of STEC in beef carcasses in abattoirs from Tucuman province. Two hundred and seventy four beef carcass sponges were processed; the count of generic E. coli was marginal in 9 (3,3%) of them. Escherichia coli O157 was isolated in 4 (1,4%) samples; 2 of which were characterized as stx2c(vh-a)/eae/ehxA whereas the other 2 were non-toxigenic strains. Non-O157 E. coli ONT:H49, stx2a/ehxA/saa was isolated from 1 sample (0,4%). In this work the quality of the analyzed product indicates that the good practices of manufacture are fulfilled in slaughtering facilities in Tucumán province.

Occurrence of Salmonella spp. and generic Escherichia coli on beef carcasses sampled at a brazilian slaughterhouse

A total of 120 beef carcasses were analyzed during processing at a slaughterhouse in southern Brazil. The carcasses were sampled by swab at three different steps of the slaughter line and then they were tested for Salmonella and E. coli. The Salmonella isolates were also examined for antimicrobial susceptibility. Salmonella prevalence distribution was modeled and the probability of contamination was simulated using @Risk program and 10,000 interactions. Results demonstrated that 4 beef carcasses (3.3%) were positive for Salmonella only in the first point. The six isolates of Salmonella were classified: S. Newport (n = 3), S. Saintpaul (n = 2) and S. Anatum (n = 1). No Salmonella strains exhibited resistance to any of the antimicrobials tested. As expected, the most contaminated point with E. coli was the first point (hide), presenting counts from 0.31 to 5.07 log cfu/100 cm². Much smaller E. coli counts were observed in the other points. Results indicated low levels of Salmonella and E. coli on the beef carcasses analyzed and also low probability of contamination of the carcasses by Salmonella, suggesting adequate microbiological quality.