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Impact of a far ultraviolet-C light intervention on dissemination of bacteriophage MS2 and a DNA marker from portable medical equipment

Published online by Cambridge University Press:  23 June 2026

Amelia Milner
Affiliation:
Cleveland VA Medical Center
Samir Memic
Affiliation:
VA Medical Center
Maria Torres-Teran
Affiliation:
Cleveland VA Medical Center
Jennifer Cadnum
Affiliation:
Cleveland VA Medical Center
Curtis Donskey
Affiliation:
Cleveland VA Medical Center

Abstract

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Background: Portable medical equipment is a potential source for transmission of healthcare-associated pathogens. However, cleaning and disinfection of equipment is suboptimal in most healthcare facilities. Methods: On a long-term care facility (LTCF) ward, we examined the impact of an intervention in which a far ultraviolet-C wand was used to provide low-level disinfection of portable equipment and high-touch items in common areas. The surrogate markers bacteriophage MS2 and cauliflower mosaic virus DNA were inoculated onto 5 portable medical devices in the morning on day 1; in the afternoon on days 1, 3, and 7 swabs for recovery of the markers and culture for pathogens were obtained from 50 surfaces including portable equipment, common areas, and resident rooms. The percentages of sites with contamination were compared for the week of the intervention versus for a control week without far UV-C exposure. Results: In the control period, the DNA marker and bacteriophage MS2 disseminated widely and were detected on non-inoculated equipment, the nursing station, and in resident rooms. In comparison to the control period, there was a significant reduction in contamination with the DNA marker during the far UV-C intervention period (P<0.01), and a trend toward reduced contamination with bacteriophage MS2 (P=0.20) and pathogens (P=0.11) (Figure). Conclusions: Surrogate markers inoculated onto portable medical equipment disseminated widely throughout a LTCF ward. Daily low-level disinfection using a far UV-C wand reduced dissemination of the surrogate markers and there was a non-significant reduction in pathogen contamination.

Three bar graphs show the impact of daily low-level disinfection on the dissemination of a DNA surrogate marker, bacteriophage MS2, and pathogen contamination.

Information

Type
Disinfection/Sterilization
Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
© The Author(s), 2026. Published by Cambridge University Press on behalf of The Society for Healthcare Epidemiology of America