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SARS-CoV-2 inactivation by ultraviolet radiation and visible light is dependent on wavelength and sample matrix #MMPMID35779426
Schuit MA; Larason TC; Krause ML; Green BM; Holland BP; Wood SP; Grantham S; Zong Y; Zarobila CJ; Freeburger DL; Miller DM; Bohannon JK; Ratnesar-Shumate SA; Blatchley ER 3rd; Li X; Dabisch PA; Miller CC
J Photochem Photobiol B 2022[Aug]; 233 (ä): 112503 PMID35779426show ga
Numerous studies have demonstrated that SARS-CoV-2 can be inactivated by ultraviolet (UV) radiation. However, there are few data available on the relative efficacy of different wavelengths of UV radiation and visible light, which complicates assessments of UV decontamination interventions. The present study evaluated the effects of monochromatic radiation at 16 wavelengths from 222 nm through 488 nm on SARS-CoV-2 in liquid aliquots and dried droplets of water and simulated saliva. The data were used to generate a set of action spectra which quantify the susceptibility of SARS-CoV-2 to genome damage and inactivation across the tested wavelengths. UVC wavelengths (=280 nm) were most effective for inactivating SARS-CoV-2, although inactivation rates were dependent on sample type. Results from this study suggest that UV radiation can effectively inactivate SARS-CoV-2 in liquids and dried droplets, and provide a foundation for understanding the factors which affect the efficacy of different wavelengths in real-world settings.