Griffiths W D, Bennett A, Speight S, Parks S
Airborne Matters, 47 Manor Road, Toddington, Dunstable LU5 6AJ, UK.
J Hosp Infect. 2005 Nov;61(3):242-7. doi: 10.1016/j.jhin.2005.03.004. Epub 2005 Jul 11.
The performance of a duct-mounted air disinfection system, designed to reduce airborne pathogens in the hospital environment, was determined using a new testing methodology. The methodology places the equipment in a test duct, a microbial aerosol is generated and then sampled simultaneously before and after the test system. This allows a percentage efficiency value to be calculated. The air disinfection system is a novel chemical-coated filter and ultraviolet (UV) radiation air purification system, operating at a flow rate of 500 m(3)/h, against aerosols of MS2 phage and Mycobacterium vaccae (surrogates of viral and mycobactericidal pathogens). A three UV lamp system was effective against airborne phages, removing an average of 97.34% of the aerosolized challenge. With the UV component switched off, the average efficiency dropped to 61.46%. This demonstrates that the chemical-coated filter component plays a more significant role than the UV radiation in destroying phages. When six UV lamps were used, the system was able to remove mycobacteria with an efficiency exceeding 99.99%. This test methodology can be used to assess manufacturers' claims of efficacy of equipment against airborne micro-organisms in the hospital environment.
采用一种新的测试方法，对旨在减少医院环境中空气传播病原体的管道式空气消毒系统的性能进行了测定。该方法将设备置于测试管道中，生成微生物气溶胶，然后在测试系统前后同时进行采样。这样就能计算出效率百分比值。该空气消毒系统是一种新型的化学涂层过滤器和紫外线（UV）辐射空气净化系统，以500立方米/小时的流速运行，针对MS2噬菌体和气生枝杆菌（病毒和杀分枝杆菌病原体的替代物）的气溶胶。一个三紫外线灯系统对空气传播的噬菌体有效，平均去除97.34%的雾化挑战物。关闭紫外线组件后，平均效率降至61.46%。这表明化学涂层过滤器组件在破坏噬菌体方面比紫外线辐射发挥着更重要的作用。当使用六个紫外线灯时，该系统能够以超过99.99%的效率去除分枝杆菌。这种测试方法可用于评估制造商关于设备在医院环境中对空气传播微生物的功效声明。
