Table 4.
Non-exhaustive list of recent efficacy studies on UVGI systems.
| Author/Year | Study location | UV Light type | Pathogen type | Disinfection method | Results |
|---|---|---|---|---|---|
| Astrid et al./2021 [77] | Outpatient hospital clinic (Austria) | Clean Room Solutions’ UVD Robot (254 nm) | Four strains of Candida auris | UVC irradiation was done on high-touch surfaces after the standard cleaning and disinfection procedure. | Reduction in target pathogen concentration in irradiated areas and negative effects in shadowed regions were observed. |
| Buonanno et al./2020 [78] | Laboratory (Israel) | Far-UVC light (222 nm) | Aerosolized alpha HCoV-229E and beta HCoV-OC43 | Target pathogens inactivated in an aerosol irradiation chamber. | 99.9% inactivation observed for UV doses of 1.2–1.7 [mJ/cm] |
| Gerchman et al./2020 [79] | Laboratory (USA) | UVC-LED system (267–297 nm) | HCoV-OC43 virus | Irradiance dosages were up to 60 s for 267 and 279 nm and up to 90 s for 286 and 297 nm UV. | Shorter UV wavelengths were more effective at inactivating the virus (3-log inactivation at irradiation 6–7 mJ/cm). |
| Heilingloh et al./2020 [80] | Laboratory (Germany) | UVC (254 nm) and/or UVA (365 nm) | SARS-CoV-2 | The emitted light was at a distance of 3 cm and viral samples were taken at 3-minute intervals for 30 min. | The emitted dose required for a complete inactivation of SARS-CoV-2 was 1048 mJ/cm after 9 min of exposure. |
| Morikane et al./2020 [81] | Hospital ICU (Japan) | PX-UV device (200–280 nm) | MRSA | Effects of adding PX-UV device to manual terminal cleaning in the hospital was evaluated for 2.5 yrs | Cases of newly acquired MRSA and Antinobector reduced significantly. |
| Yıldırım et al./2015 [57] | Acute-care hospitals (USA) | PX-UV device (200–280 nm) | C. difficile, MRSA, and VRE | Pathogen contamination on high-touch surfaces was assessed before and after 10 min of PX-UV irradiation. | PX-UV device lowered the recovery of C. difficile spores, MRSA, and VRE. |