Is the Pulsed Xenon Ultraviolet Light No-Touch Disinfection System Effective on MRSA in the Absence of Manual Cleaning?
Methods: Five high touch surfaces (bedrail, tray table, call button, toilet seat and toilet grab rail) were sampled for aerobic colony counts and MRSA, using Rodac contact plates (Hardy Diagnostics, Santa Monica, CA), before and after pulsed xenon UV disinfection. For non-flat surfaces, roll plate technique was used. The PX-UV was placed and run for 5 minutes each in 3 positions: once on both sides of the bed and once in the bathroom, exposing the above mentioned high touch surfaces (a total of 15 minutes of PX-UV exposure per room). The plates were then incubated at 35-37OC for 48 hours. For aerobic bacterial counts, individual colonies were counted, and the number was recorded. For MRSA, deep pink or mauve colored colonies were identified as MRSA, and colony counts were recorded. Further, these colonies were confirmed as MRSA by using standard methods. When the colony counts for aerobic bacteria or MRSA were too numerous to count or if the colony counts were greater than 200, the colony count was recorded as 200 to prevent outliers.
Results: We sampled a total of 15 rooms. We found 5747 aerobic bacterial colonies before and 1256 (78% reduction) after PX-UV disinfection. Similarly, we observed 202 MRSA colonies before and 66 (67% reduction) after PX-UV disinfection.
Conclusion: Our results demonstrated that ‘no-touch’ pulsed xenon UV disinfection system is effective in reducing aerobic bacterial burden and MRSA from the high touch surfaces in a patient room in the absence of any manual cleaning. This information is relevant to understand what happens when environmental management services personnel fail to wipe down a surface.
xenex: Grant Investigator, Research grant
K. Sikes, None
N. Ganachari-Mallappa, None