Modulation of COVID19 Epidemiology by UV-B and - A Photons from the Sun

12 Pages Posted: 15 Jun 2020

See all articles by Fabrizio Nicastro

Fabrizio Nicastro

Istituto Nazionale di Astrofisica (INAF) - Milano

Giorgia Sironi

Istituto Nazionale di Astrofisica (INAF) - Milano

Elio Antonello

Istituto Nazionale di Astrofisica (INAF) - Milano

Andrea Bianco

Istituto Nazionale di Astrofisica (INAF) - Milano

Mara Biasin

Universita di Milano

John Brucato

Istituto Nazionale di Astrofisica (INAF) - Milano

Ilaria Ermolli

Istituto Nazionale di Astrofisica (INAF) - Milano

Giovanni Pareschi

Istituto Nazionale di Astrofisica (INAF) - Milano

Marta Salvati

Regional Agency for Environmental Protection of Lombardia (ARPA Lombardia)

Paolo Tozzi

Istituto Nazionale di Astrofisica (INAF) - Milano

Daria Trabattoni

Universita di Milano

Mario Clerici

Universita di Milano

Date Written: June 4, 2020

Abstract

It is well known that 200-290 nm ultraviolet photons (hereinafter UV-C radiation) photo-chemically interacts with DNA and RNA and are endowed with germicidal properties that are also effective on viruses (1-8). Fortunately, Solar UV-C photons of this wavelength are filtered out by the Ozone layer of the upper Atmosphere, at around 35 km (9). Softer UV photons from the Sun with wavelengths in the range 290-320 nm (UV-B) and 320-400 nm (UV-A), however, do reach the Earth’s surface. The effect of these photons on Single- and Double-Stranded RNA/DNA viruses (9-12) and the possible role they play on the seasonality of epidemics (13), are nevertheless little studied and highly debated in alternative or complementarity to other environmental causes (14-20). Notably though, the effects of both direct and indirect radiation from the Sun needs to be considered in order to completely explain the effects of UV radiations in life processes (with e.g. the UV virucidal effect enhanced in combination to the concomitant process of water droplets depletion because of Solar heat). Herein we present a number of concurring circumstantial evidence suggesting that the evolution and strength of the recent Severe Acute Respiratory Syndrome (SARS-CoV-2) pandemics (21, 22), might be have been modulated by the intensity of UV-B and UV-A Solar radiation hitting different regions of Earth during the diffusion of the outbreak between January and May 2020. Out findings, if confirmed by more in depth data analysis and modeling of the epidemics, which includes Solar modulation, could help in designing the social behaviors to be adopted depending on season and environmental conditions.

Note: Conflict of Interest: Authors have no competing interest to disclose.

Funding: This research has been carried out just with internal resources of INAF and University of Milan

Keywords: COVID19, Sars-CoV-2, UV light disinfection, Sun illumination, Pandemic Modulation

Suggested Citation

Nicastro, Fabrizio and Sironi, Giorgia and Antonello, Elio and Bianco, Andrea and Biasin, Mara and Brucato, John and Ermolli, Ilaria and Pareschi, Giovanni and Salvati, Marta and Tozzi, Paolo and Trabattoni, Daria and Clerici, Mario, Modulation of COVID19 Epidemiology by UV-B and - A Photons from the Sun (June 4, 2020). Available at SSRN: https://ssrn.com/abstract=3620694 or http://dx.doi.org/10.2139/ssrn.3620694

Fabrizio Nicastro (Contact Author)

Istituto Nazionale di Astrofisica (INAF) - Milano ( email )

Via e. Bianchi 46
Merate, Lc 23805
Italy

Giorgia Sironi

Istituto Nazionale di Astrofisica (INAF) - Milano ( email )

Via e. Bianchi 46
Merate, Lc 23805
Italy

Elio Antonello

Istituto Nazionale di Astrofisica (INAF) - Milano ( email )

Via e. Bianchi 46
Merate, Lc 23805
Italy

Andrea Bianco

Istituto Nazionale di Astrofisica (INAF) - Milano ( email )

Via e. Bianchi 46
Merate, Lc 23805
Italy

Mara Biasin

Universita di Milano ( email )

via Golgi 19
Milano, I-20133
Italy

John Brucato

Istituto Nazionale di Astrofisica (INAF) - Milano ( email )

Via e. Bianchi 46
Merate, Lc 23805
Italy

Ilaria Ermolli

Istituto Nazionale di Astrofisica (INAF) - Milano ( email )

Via e. Bianchi 46
Merate, Lc 23805
Italy

Giovanni Pareschi

Istituto Nazionale di Astrofisica (INAF) - Milano ( email )

Via e. Bianchi 46
Merate, Lc 23805
Italy

Marta Salvati

Regional Agency for Environmental Protection of Lombardia (ARPA Lombardia) ( email )

Milano
Italy

Paolo Tozzi

Istituto Nazionale di Astrofisica (INAF) - Milano ( email )

Via e. Bianchi 46
Merate, Lc 23805
Italy

Daria Trabattoni

Universita di Milano ( email )

via Golgi 19
Milano, I-20133
Italy

Mario Clerici

Universita di Milano ( email )

via Golgi 19
Milano, I-20133
Italy

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