How ultraviolet light could reduce respiratory infection in aged care
A recent study reveals that ultraviolet (UV) light technology can significantly reduce respiratory viral infections in long-term residential aged care settings. This finding is particularly relevant as respiratory infections pose a significant risk to the elderly, who are more vulnerable to severe outcomes.
The Challenge of Respiratory Infections in Aged Care
Respiratory viral infections are a major concern for aged care facilities, as they can lead to hospitalizations and deaths, especially among the elderly. The COVID-19 pandemic highlighted the devastating impact of rapid respiratory virus transmission in these settings, with Australians aged over 65 accounting for around 95% of deaths. Outbreaks in residential aged care facilities, where infection risk is heightened due to communal living and underlying health conditions, often reported mortality rates above 30%.
Addressing All Transmission Modes
A key challenge in preventing respiratory infections is addressing all major transmission modes. Current measures like facemasks and physical distancing primarily target cough droplets, which settle onto surfaces quickly. However, airborne transmission, involving infective aerosols that remain suspended in the air for longer, has been largely overlooked, despite evidence of its importance in built environments.
Germicidal Ultraviolet Light Technology
One promising approach to preventing airborne transmission is germicidal ultraviolet (GUV) light technology. This technology can render viruses non-infectious by damaging their nucleic acids and has shown effectiveness in laboratory settings for various respiratory viruses. However, real-world evidence of its effectiveness in protecting vulnerable populations, such as aged care residents, was lacking.
The Study: Germicidal Ultraviolet Light in Aged Care
To address this gap, researchers conducted a two-year randomized cluster-controlled clinical trial in South Australia. They installed commercially available GUV appliances in communal areas of residential aged care facilities, such as dining rooms and corridors, and compared infection rates between intervention and control zones. The study design allowed for direct comparisons, regardless of evolving infection control measures.
Findings: Significant Reduction in Infections
While the primary outcome didn't show a statistically significant reduction in infection rates during individual intervention periods, the cumulative incidence of infections over the study period was significantly lower. During active intervention periods, the number of infections was 12.2% lower compared to control, equating to over 90 fewer cases per 1000 residents annually.
Potential to Save Lives
The study's findings are particularly encouraging given the challenging circumstances of the COVID-19 pandemic. Extrapolating the results to the approximately 250,000 Australians living in long-term aged care suggests the potential to prevent around 23,000 cases, 2,300 hospitalizations, and 90 deaths each year. These reductions would have a significant impact on both resident health and the healthcare system.
Further Research and Considerations
While the study provides promising results, further research is needed to confirm these benefits and optimize implementation. Future studies should explore deployment strategies and conduct comprehensive cost-benefit analyses, considering factors like staff absenteeism and operating costs. Additionally, the potential benefits for residents at increased risk, including those with chronic respiratory conditions or advanced dementia, should be examined.
A Multifaceted Approach
It's important to emphasize that no single intervention can prevent respiratory infections in aged care. GUV technology should be viewed as a complementary measure, enhancing established practices like surface hygiene, social distancing, and vaccination, rather than replacing them.
Authors' Disclosures
The authors declare no conflicts of interest beyond their academic appointments.
