If exposed to sunlight, the SARS-CoV-2 contained in the saliva droplets and deposited on different materials, is inactivated after a few minutes. This is what the research ‘Simulated Sunlight Rapidly Inactivates SARS-CoV-2 on Surfaces’ claims and published on May 20 by the University of Oxford in the Journal of Infectious Diseases.
According to the preface, “previous studies have shown that the COVID-19 virus is stable on surfaces for long periods in indoor environments”. In this study, however, researchers carried out experiments “artificially recreating the light and solar radiation representative of the summer solstice at 40 ° N latitude at sea level on a clear day”. It emerged that simulated sunlight is capable of inactivating 90% of the viruses in the solution that mimicked saliva in 6.8 minutes and in 14.3 minutes in culture media. Significant inactivation also occurred, albeit at a slower speed, at lower simulated sunlight levels. ”
“This study – reads – provides the first evidence that sunlight can rapidly inactivate SARS-CoV-2 on surfaces, suggesting that persistence, and therefore the risk of exposure, can vary significantly between indoor and outdoor environments. Furthermore, these data indicate that natural sunlight can be effective as a disinfectant for contaminated non-porous materials.