• Chetan Jinadatha, Frank C Villamaria, Marcos I Restrepo, Nagaraja Ganachari-Mallappa, I-Chia Liao, Eileen M Stock, Laurel A Copeland, and John E Zeber.
• Department of Medicine, Central Texas Veterans Healthcare System, Temple, TX; Department of Medicine, College of Medicine, Texas A&M Health Science Center, Bryan, TX. Electronic address: chetan.jinadatha@va.gov.
• Am J Infect Control. 2015 Aug 1; 43 (8): 878-81.

BackgroundMethicillin-resistant Staphylococcus aureus (MRSA) has been shown to survive on ambient surfaces for extended periods of time. Leftover MRSA environmental contamination in a hospital room places future patients at risk. Manual disinfection supplemented by pulsed xenon ultraviolet (PX-UV) light disinfection has been shown to greatly decrease the MRSA bioburden in hospital rooms. However, the effect of PX-UV in the absence of manual disinfection has not been evaluated.MethodsRooms that were previously occupied by a MRSA-positive patient (current colonization or infection) were selected for the study immediately postdischarge. Five high-touch surfaces were sampled, before and after PX-UV disinfection, in each hospital room. The effectiveness of the PX-UV device on the concentration of MRSA was assessed employing a Wilcoxon signed-rank test for all 70 samples with MRSA in 14 rooms, as well as by surface location.ResultsThe final analysis included 14 rooms. Before PX-UV disinfection there were a total of 393 MRSA colonies isolated from the 5 high-touch surfaces. There were 100 MRSA colonies after disinfection by the PX-UV device and the overall reduction was statistically significant (P < .01).ConclusionsOur study results suggest that PX-UV light effectively reduces MRSA colony counts in the absence of manual disinfection. These findings are important for hospital and environmental services supervisors who plan to adapt new technologies as an adjunct to routine manual disinfection.Published by Elsevier Inc.

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