Solar UV-C photons do not reach Earth’s surface, but are known to be endowed with germicidal properties that are also effective on viruses. The effect of softer UV-B and UV-A photons, which copiously reach the Earth’s surface, on viruses are instead little studied, particularly on single-stranded RNA viruses. Here we combine our measurements of the action spectrum of Covid-19 in response to UV light, Solar irradiation measurements on Earth during the SARS-CoV-2 pandemics, worldwide recorded Covid-19 mortality data and our “Solar-Pump” diffusive model of epidemics to show that (a) UV-B/A photons have a powerful virucidal effect on the single-stranded RNA virus Covid-19 and that (b) the Solar radiation that reaches temperate regions of the Earth at noon during summers, is sufficient to inactivate 63% of virions in open-space concentrations (1.5 × 103 TCID50/mL, higher than typical aerosol) in less than 2 min. We conclude that the characteristic seasonality imprint displayed world-wide by the SARS-Cov-2 mortality time-series throughout the diffusion of the outbreak (with temperate regions showing clear seasonal trends and equatorial regions suffering, on average, a systematically lower mortality), might have been efficiently set by the different intensity of UV-B/A Solar radiation hitting different Earth’s locations at different times of the year. Our results suggest that Solar UV-B/A play an important role in planning strategies of confinement of the epidemics, which should be worked out and set up during spring/summer months and fully implemented during low-solar-irradiation periods.
Solar UV-B/A radiation is highly effective in inactivating SARS-CoV-2 / F. Nicastro, G. Sironi, E. Antonello, A. Bianco, M. Biasin, J.R. Brucato, I. Ermolli, G. Pareschi, M. Salvati, P. Tozzi, D. Trabattoni, M. Clerici. - In: SCIENTIFIC REPORTS. - ISSN 2045-2322. - 11:1(2021 Jul 20), pp. 14805.1-14805.11. [10.1038/s41598-021-94417-9]
|Titolo:||Solar UV-B/A radiation is highly effective in inactivating SARS-CoV-2|
|Settore Scientifico Disciplinare:||Settore BIO/13 - Biologia Applicata|
Settore MED/04 - Patologia Generale
|Data di pubblicazione:||20-lug-2021|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1038/s41598-021-94417-9|
|Appare nelle tipologie:||01 - Articolo su periodico|