Solar UV-B/A radiation is highly effective in inactivating SARS-CoV-2
Abstract 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-st...
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Nature Portfolio
2021
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oai:doaj.org-article:7b5d65d288e7446e9cb520a69347b4f32021-12-02T17:03:50ZSolar UV-B/A radiation is highly effective in inactivating SARS-CoV-210.1038/s41598-021-94417-92045-2322https://doaj.org/article/7b5d65d288e7446e9cb520a69347b4f32021-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-94417-9https://doaj.org/toc/2045-2322Abstract 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.Fabrizio NicastroGiorgia SironiElio AntonelloAndrea BiancoMara BiasinJohn R. BrucatoIlaria ErmolliGiovanni PareschiMarta SalvatiPaolo TozziDaria TrabattoniMario ClericiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021) |
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Medicine R Science Q Fabrizio Nicastro Giorgia Sironi Elio Antonello Andrea Bianco Mara Biasin John R. Brucato Ilaria Ermolli Giovanni Pareschi Marta Salvati Paolo Tozzi Daria Trabattoni Mario Clerici Solar UV-B/A radiation is highly effective in inactivating SARS-CoV-2 |
| description |
Abstract 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. |
| format |
article |
| author |
Fabrizio Nicastro Giorgia Sironi Elio Antonello Andrea Bianco Mara Biasin John R. Brucato Ilaria Ermolli Giovanni Pareschi Marta Salvati Paolo Tozzi Daria Trabattoni Mario Clerici |
| author_facet |
Fabrizio Nicastro Giorgia Sironi Elio Antonello Andrea Bianco Mara Biasin John R. Brucato Ilaria Ermolli Giovanni Pareschi Marta Salvati Paolo Tozzi Daria Trabattoni Mario Clerici |
| author_sort |
Fabrizio Nicastro |
| title |
Solar UV-B/A radiation is highly effective in inactivating SARS-CoV-2 |
| title_short |
Solar UV-B/A radiation is highly effective in inactivating SARS-CoV-2 |
| title_full |
Solar UV-B/A radiation is highly effective in inactivating SARS-CoV-2 |
| title_fullStr |
Solar UV-B/A radiation is highly effective in inactivating SARS-CoV-2 |
| title_full_unstemmed |
Solar UV-B/A radiation is highly effective in inactivating SARS-CoV-2 |
| title_sort |
solar uv-b/a radiation is highly effective in inactivating sars-cov-2 |
| publisher |
Nature Portfolio |
| publishDate |
2021 |
| url |
https://doaj.org/article/7b5d65d288e7446e9cb520a69347b4f3 |
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