Germicidal UV Technology Reduces Respiratory Infections in Seniors

In recent developments, researchers at the Flinders Health and Medical Research Institute (FHMRI) and the South Australian Health and Medical Research Institute (SAHMRI) have unveiled promising advancements in infection control for older Australians living in aged care facilities. The study, published in the *Journal of the American Medical Association Internal Medicine* on July 29, 2025, highlights the efficacy of germicidal ultraviolet (GUV) air-treatment technology in significantly lowering rates of respiratory infections, including those caused by viruses such as COVID-19.

The trial involved the installation of commercially available GUV appliances across four aged care homes in South Australia. These appliances utilize UV-C light rays to deactivate harmful microorganisms in the air, thereby improving indoor air quality. According to Dr. Andrew Shoubridge, lead author of the study and a researcher at both FHMRI and SAHMRI, the results indicated a reduction of viral respiratory infections by 12.2%, equating to approximately 0.3 fewer cases per week in the tested facilities.

"The key advantages of these GUV appliances are their ease of installation and cost-effectiveness," Dr. Shoubridge stated. "When combined with existing infection control measures, they could potentially transform the protection of vulnerable residents against seasonal viral outbreaks and emerging pathogens."

The study underscores the pressing need for effective infection control technologies in residential aged care facilities, where older adults are particularly susceptible to severe respiratory diseases. Senior author Professor Geraint Rogers, who conceived the trial, emphasized the importance of proactive measures in safeguarding this demographic. "Outbreaks of respiratory viruses can have devastating consequences for older individuals, leading to increased rates of hospitalization and mortality," he explained.

The GUV appliances were installed in communal areas of the selected aged care homes, which typically experience higher foot traffic and increased risk of airborne virus transmission. The research design included a randomized clinical trial that tracked infection rates over a two-year period, comparing environments with and without the GUV technology.

Despite the appliances not showing a reduction in infection rates during shorter study intervals, the overall results suggest a significant positive impact on the health of aged care residents. Professor Rogers remarked, "Given the current landscape, one must question why these appliances are not more widely adopted in aged care settings."

This innovative approach to infection control is particularly relevant in light of the ongoing global health challenges posed by the COVID-19 pandemic. As of now, approximately 250,000 Australians reside in aged care facilities, highlighting the scale at which this technology could potentially make a difference.

The research was supported by a Medical Research Future Fund grant from the Australian Government, with various researchers disclosing affiliations with significant funding sources, including NHMRC Investigator Grants. The collaborative effort included partnerships with several aged care facilities, such as Barmera Health Service and Allambi Residential Care Home, among others.

The implications of this research extend beyond aged care facilities, as GUV technology could be adapted for use in a variety of settings where air quality and pathogen control are critical. Looking forward, the study opens avenues for further exploration into air purification technologies as essential tools in the fight against respiratory infections, particularly in preparation for future pandemics.

In conclusion, the implementation of germicidal UV technology presents a transformative opportunity for enhancing the health and safety of older Australians, potentially setting new standards in infection control within the aged care sector and beyond.