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Do pneumatic tube transport systems transmit potential pathogens? A hygienic risk assessment in a university hospital.
Journal of Hospital Infection ( IF 6.9 ) Pub Date : 2019-11-20 , DOI: 10.1016/j.jhin.2019.11.009
L Khaznadar 1 , S J Dancer 2 , A Petersmann 3 , U Seifert 4 , H Below 1 , R Papke 1 , M Suchomel 5 , T Kohlmann 6 , A Kramer 1
Affiliation  

BACKGROUND Prompted by an outbreak of vancomycin-resistant enterococci (VRE) in a medical facility, this study examined a pneumatic tube transport system (PTS) as a potential transmission channel. METHOD Samples from the receiving station and entry racks were gathered via smear technique. Sponges used for PTS decontamination were soaked with 0.89% NaCl and transported through the channel. Micro-organisms were recovered from the tubes and cleaning sponges using a wash-away technique. Air sampling was performed at the receiving station in order to detect any airborne contamination. Tubes were artificially inoculated with Escherichia coli K12 NCTC 10538 and Staphylococcus epidermidis DSM 20044 and sent through the PTS to investigate channel contamination. RESULTS No pathogens were detected in effluent air from the PTS or in tubes during routine operation. Entry racks for the test tubes were contaminated with coagulase-negative staphylococci (CNS), aerobic bacilli, moulds and vancomycin-susceptible Enterococcus faecium. E. coli proved to be unsuitable for detecting bacterial transmission by the PTS due to low persistence, but S. epidermidis was more resilient. After sending contaminated test tubes through the PTS, levels of S. epidermidis only decreased marginally. Subsequently, sponges soaked with disinfectant solution were put through the system and these eliminated S. epidermidis completely from the first attempt. DISCUSSION Routine hygienic maintenance of the PTS makes pathogen transmission highly unlikely, although entry racks should be disinfected regularly. Any involvement of the PTS in the VRE outbreak at the study institution was unlikely.

中文翻译:

气动管传输系统是否传播潜在的病原体?大学医院的卫生风险评估。

背景技术由于在医疗机构中出现耐万古霉素的肠球菌(VRE)的爆发,这项研究检查了气管运输系统(PTS)作为潜在的传输通道。方法通过涂片技术收集来自接收站和进入架的样品。用于PTS去污的海绵用0.89%NaCl浸泡并通过通道运输。使用冲洗技术从试管和清洁海绵中回收微生物。为了检测任何空气污染,在接收站进行了空气采样。将试管用大肠杆菌K12 NCTC 10538和表皮葡萄球菌DSM 20044人工接种,并通过PTS进行研究,以调查通道污染情况。结果在常规操作期间,PTS的排出空气或试管中未检测到病原体。试管的入口架被凝固酶阴性葡萄球菌(CNS),好氧杆菌,霉菌和对万古霉素敏感的粪肠球菌污染。由于持久性低,证明大肠杆菌不适合通过PTS检测细菌传播,但表皮葡萄球菌更具弹性。通过PTS发送受污染的试管后,表皮葡萄球菌的水平仅略有下降。随后,将浸泡有消毒剂溶液的海绵通过系统,从第一次尝试中就完全消除了这些表皮葡萄球菌。讨论尽管应该对进入架进行定期消毒,但对PTS进行常规卫生维护极不可能使病原体传播。
更新日期:2019-11-21
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