The slaughter process plays an important role in animal welfare, meat quality, safety and public health through the meat production chain. In this study, we performed a three-stage evaluation: I) comprehensive evaluation, II) implementation of improvement actions and III) verification of the success of the actions implemented in three abattoirs from Argentina during 2016-2018. Risk was estimated using two checklists, quantified on a 1-100 scale and classified as high (1-40), moderate (41-70) and low (71-100). In stages I and III, Salmonella spp., E. coli O157:H7 and non-O157 STEC were detected and isolated in samples from carcasses (n = 252), the environment (n = 252); head meat (n = 21) and viscera washing and chilling water (n = 105). Carcass samples were analyzed for mesophilic aerobic organisms, coliforms and E. coli enumeration. Of 201 water samples taken, 42.0-75.6 % were non-potable quality. After the implementation of improvement actions in stage II (building, processes, systems for water purification and training), the estimation of risk of contamination was reduced from high to moderate in all three abattoirs, the count of indicator microorganisms decreased in two abattoirs, and the presence of pathogens significantly decreased. Salmonella spp. was not isolated from any of the samples collected in two abattoirs. Isolation of E. coli O157:H7 decreased in carcass and was not isolated from viscera washing and chilling water. Isolation of non-O157 STEC decreased in carcass but not in environmental samples. Finally, 75.0-95.0 % of water samples were of potable quality. Although this was only the first step in the process of change and improvement of abattoirs, the assessment of the situation and the proposal of solutions to correct deviations in a joint effort with the health authorities helped to implement a work model for enhancing food safety before meat reaches consumers.

中文翻译：

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对牛屠宰场中减少病原体暴露的改善措施进行综合评估和实施。

屠宰过程通过肉类生产链在动物福利，肉类质量，安全和公共卫生中发挥着重要作用。在这项研究中，我们进行了三个阶段的评估：I）综合评估，II）改进措施的实施以及III）在2016-2018年期间在阿根廷的三个屠宰场中实施的措施的成功性验证。使用两个清单对风险进行评估，该清单以1-100的比例进行量化，分为高（1-40），中（41-70）和低（71-100）。在第一和第三阶段，从尸体（n = 252），环境（n = 252）的样品中检出并分离出沙门氏菌，大肠杆菌O157：H7和非O157 STEC。头肉（n = 21）和内脏洗冷水（n = 105）。分析体样品的中温需氧生物，大肠菌群和大肠杆菌计数。在所采集的201个水样本中，有42.0-75.6％是非饮用水。在第二阶段（建筑，流程，净水和培训系统）实施改进措施后，所有三个屠宰场的污染风险估计从高到中降低，两个屠宰场的指示微生物数量减少，并且病原体的存在明显减少。沙门氏菌 没有从两个屠宰场收集的任何样品中分离出来。car体中大肠杆菌O157：H7的分离减少，并且未从内脏洗涤和冷却水中分离出来。-体中非O157 STEC的分离减少，但环境样品中的分离没有减少。最终，有75.0-95.0％的水样品为饮用水。尽管这只是屠宰场变化和改进过程的第一步，