Does the introduction of two new disinfecting technologies reduce the risk of cross infection in a busy office environment? Andrew Kemp, Head of the Scientific Advisory Board for the British Institute of Cleaning Science presents a study examining the measurement of surface contamination levels.
Bacterial counts were taken from two busy office rooms. One as a control, the second as treated room. The treatment consisted of two new technologies, firstly a persistent disinfectant and secondly an air-cleansing system. Both rooms were tested, after routine standard cleaning and before the start of the business day, and then again at the end of the business day and before routine standard cleaning. Live Colony Forming Unit (CFU) counts were obtained using a hyper-accurate Bacteria Specific Rapid Metabolic Assay (BSRMA) test.1,2 In addition, blood agar cultures were used for species identification.
During the 48-hour testing period, the room used as the control, showed an over 500% increase in surface bacterial bio burden by the end of the working day, on both days. The treated room showed a significant reduction in CFU counts, and by day two no samples had grown cultures on any plates. Surface live bacterial counts were reduced to less than one CFU per cm2.
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