Effectiveness of ceiling-mounted ultraviolet-C lamps: An experimental study in a biocontainment unit of a tertiary care hospital.

IF 3.8 3区医学 Q2 INFECTIOUS DISEASES

American journal of infection control Pub Date : 2024-06-28 DOI:10.1016/j.ajic.2024.06.020

Jeongyoung Lee, Eun Ju Kim, Young-Ju Lim, Eun Ok Kim, Seongman Bae, Jiwon Jung, Sung-Han Kim

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Abstract

Background: 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. 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 < .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.

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安装在天花板上的紫外线-C 灯的效果：在一家三甲医院生物隔离病房进行的实验研究。

背景：安装在天花板上的紫外线-C灯管不需要单独的空间或人力运输，但有关其表面消毒效果的数据却很少。我们的目的是评估安装在天花板上的紫外线-C 灯的性能：这项研究是在韩国一家三甲医院生物隔离病房的一个装有紫外线-C 灯的空房间里进行的。紫外线-C 灯安装在病房、前厅和厕所的天花板上。将每种病原体（金黄色葡萄球菌、大肠杆菌、克柔斯念珠菌、蜡样芽孢杆菌和佩氏分枝杆菌）接种到血琼脂平板上，并放置在距离紫外线-C 灯 20 个选定位置，照射 15 分钟。作为对照组，菌液稀释 10 000 倍，不照射紫外线：与对照组相比，紫外线照射平均（±SD）减少了 5.95 ± 0.91 个对数。金黄色葡萄球菌的对数降低幅度最大[中位数，7.05（IQR，6.49-7.26）]，佩里格氏菌的对数降低幅度最小[中位数，4.88（IQR，4.58-5.24）]。对数减少的程度与紫外线-C 灯距离的平方成反比（R2 = -0.12，p < 0.001）：在这项研究中，安装在天花板上的紫外线-C 能在 4 米距离内有效消毒，至少能将测试微生物的对数减少 4 个对数。安装紫外线-C 照明设备是提高表面消毒效果的重要选择。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

American journal of infection control 医学-传染病学

CiteScore

7.40

自引率

4.10%

发文量

479

审稿时长

24 days

期刊介绍： AJIC covers key topics and issues in infection control and epidemiology. Infection control professionals, including physicians, nurses, and epidemiologists, rely on AJIC for peer-reviewed articles covering clinical topics as well as original research. As the official publication of the Association for Professionals in Infection Control and Epidemiology (APIC)