222 nm far-UVC light markedly reduces infectious airborne virus in an occupied room
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This empirical study on far-UVC light's efficacy against airborne viruses is relevant to AI safety biosecurity research, demonstrating technological interventions for pandemic preparedness and occupational safety in high-risk settings.
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This study demonstrates that 222 nm far-UVC light effectively reduces infectious airborne viruses in occupied indoor spaces. Researchers installed four 222-nm light fixtures in a mouse-cage cleaning room and measured the reduction of aerosolized murine norovirus (MNV), a conservative surrogate for influenza and coronavirus. The far-UVC treatment achieved a 99.8% reduction in infectious airborne MNV while remaining within regulatory safety limits. This is the first direct demonstration of far-UVC efficacy against airborne pathogens in an actual occupied room, suggesting potential for controlling airborne-mediated disease transmission in real-world settings.
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222 nm far-UVC light markedly reduces the level of infectious airborne virus in an occupied room | Scientific Reports
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222 nm far-UVC light markedly reduces the level of infectious airborne virus in an occupied room
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Subjects
Applied microbiology
Viral transmission
Abstract
An emerging intervention for control of airborne-mediated pandemics and epidemics is whole-room far-UVC (200–235 nm). Laboratory studies have shown that 222-nm light inactivates airborne pathogens, potentially without harm to exposed occupants. While encouraging results have been reported in benchtop studies and in room-sized bioaerosol chambers, there is a need for quantitative studies of airborne pathogen reduction in occupied rooms. We quantified far-UVC mediated reduction of aerosolized murine norovirus (MNV) in an occupied mouse-cage cleaning room within an animal-care facility. Benchtop studies suggest that MNV is a conservative surrogate for airborne viruses such as influenza and coronavirus. Using four 222-nm fixtures installed in the ceiling, and staying well within current recommended regulatory limits, far-UVC reduced airborne infectious MNV by 99.8% (95% CI: 98.2–99.9%). Similar to previous room-sized bioaerosol chamber studies on far-UVC efficacy, these results suggest that aerosolized virus susceptibility is significantly higher in room-scale tests than in bench-scale laboratory studies. That said, as opposed to controlled laboratory studies, uncertainties in this study related to airflow patterns, virus residence time, and dose to the collected virus introduce uncertainty into the inactivation estimates. This study is the first to directly demonstrate far-UVC anti-microbial efficacy against airborne pathogens in an occupied indoor location.
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