This study aimed to evaluate the effectiveness of a water spray system in cleaning conveyor belts contaminated with Salmonella and Listeria monocytogenes. Samples were obtained from modular and smooth conveyor belts from four slaughterhouses in Brazil, and bacterial presence was assessed in sprayed and unsprayed belts. From each conveyor belt, 400 cm² were sampled using sponges at various time periods (T₀: 5:00 h; T₁: 9:00 h; T₂: 17:00 h, and T₃: 22:00 h), and these samples were submitted for Salmonella and L. monocytogenes detection. The results were expressed as frequencies and analyzed by Chi-square test. A low frequency of Salmonella isolation occurred at T₀, and at T₁ and T₂, the isolation frequencies of Salmonella were higher in the unsprayed conveyor belts. Salmonella contamination throughout the process fluctuated significantly (P < 0.05), and fluctuation occurred regardless of water spray use. In regard to the effect of water spraying on the presence of L. monocytogenes, the isolation frequencies were lower (P < 0.05) at all time points when the water spray system was active. Given this, our findings indicate that although water spray hygiene influences the frequency of pathogen isolation, other factors require monitoring to control for Salmonella and L. monocytogenes contamination.

这项研究的目的是评估喷水系统在清洁被沙门氏菌和单核细胞增生性李斯特菌污染的输送带上的有效性。从巴西四个屠宰场的模块化，光滑的传送带上获取样品，并评估喷雾和未喷雾带中细菌的存在。从每个传送带，400厘米²使用在不同的时间段（T海绵取样₀：;吨5:00ħ ₁：09：00小时;Ť ₂：17：00小时，和T ₃：22:00） ，并且这些样品已提交沙门氏菌和单核细胞增生李斯特菌检测。结果表示为频率并通过卡方检验进行分析。沙门氏菌的分离频率较低，出现在T ₀，而在T ₁和T _2处，沙门氏菌的分离频率在未喷雾的输送带中较高。在整个过程中，沙门氏菌的污染波动很大（P <0.05），并且无论是否使用喷水剂，都会发生波动。关于喷水对单核细胞增生李斯特菌存在的影响，当喷水系统处于活动状态时，隔离频率在所有时间点均较低（P <0.05）。鉴于此，我们的发现表明，尽管喷水卫生会影响病原体分离的频率，但还需要进行其他因素监测以控制沙门氏菌和单核细胞增生李斯特菌污染。