背景:安装的UV-C灯不需要单独的空间或劳动力进行运输,但是关于其表面消毒效果的数据很少。我们旨在评估天花板安装的UV-C灯的性能。
方法:这项研究是在韩国一家三级保健医院的生物防护单元的一个装有UV-C灯的空房间中进行的。在病房的天花板上安装了UV-C灯,前厅,和厕所。每种病原体(金黄色葡萄球菌,大肠杆菌,克鲁斯念珠菌,蜡样芽孢杆菌,和Peregrinum分枝杆菌)接种在血琼脂平板上,并从UV-C灯放置在20个选定的地方,并照射15分钟。作为对照组,将细菌溶液稀释10,000倍并且不施加UV。
结果:与对照相比,用UV照射观察到5.95±0.91log的平均值±SD减少。金黄色葡萄球菌的对数减少最大[中位数,7.05(IQR,6.49-7.26)]且至少适用于M.peregrinum[中位数,4.88(IQR,4.58-5.24)].对数减少的程度与距UV-C灯的距离的平方成反比(R2=-0.12,p<0.001)。
结论:在这项研究中,安装在天花板上的UV-C在4-m的距离内证明了至少4-log减少的测试生物的有效消毒。安装UV-C照明是改善表面消毒的重要选择。
BACKGROUND: The mounted UV-C lamp requires no separate space or labor for transport, but data on its effectiveness for surface disinfection are scarce. We aimed to evaluate the performance of ceiling-mounted UV-C lamps.
METHODS: This study was conducted in an empty room with UV-C lamps in the biocontainment unit of a tertiary care hospital in South Korea. UV-C lamps were installed on the ceiling of the patient room, anteroom, and toilet. Each pathogen (Staphylococcus aureus, Escherichia coli, Candida krusei, Bacillus cereus, and Mycobacterium peregrinum) was inoculated on blood agar plates and placed in 20 selected places from the UV-C lamp, and irradiation was applied for 15 min. As a control group, the bacterial solution was diluted 10,000 times and UV was not applied.
RESULTS: A mean ± SD of 5.95 ± 0.91 log reduction was observed with UV irradiation compared with the control. The log reduction was greatest for S. aureus [median, 7.05 (IQR, 6.49-7.26)] and least for M. peregrinum [median, 4.88 (IQR, 4.58-5.24)]. The degree of log reduction was inversely proportional to the square of the distance from the UV-C lamp (R2 = -0.12, p < 0.001).
CONCLUSIONS: In this study, ceiling-mounted UV-C demonstrated effective disinfection of at least 4-log reduction of the test organisms within a 4-m distance. Mounted UV-C lighting is a considerable option for improving surface disinfection.