The sun and ultraviolet light make Covid “ineffective”, says a study by the state


Ultraviolet light and sun rays vs Coronavirus. A study by the State University – with the collaboration of researchers from the National Institute of Astrophysics Inaf, the National Cancer Institute of Milan Int and the Irccs Fondazione Don Gnocchi – analyzed the impact of “radiation” on the new Sars-Cov- 2 and found that precisely those “radiations” are enemies of the virus.

“The short wavelength ultraviolet light, or UV-C radiation, that typically produced by low-cost mercury lamps, has excellent efficacy in neutralizing the Sars-Cov-2 coronavirus”, assure the Milanese university. “The germicidal power of UV-C light, which typically has a wavelength of 254 nanometers, or 254 billionths of a meter, on bacteria and viruses is well known, a property due to its ability to break the molecular bonds of DNA and RNA that make up these microorganisms. Various systems based on UV-C light are already used for the disinfection of environments and surfaces in hospitals and public places “.

Uv rays and the sun against Covid

The real news is that researchers at the State University have verified that UV-C kids also have “power” against Coronavirus. “We illuminated with UV light solutions to different concentrations of viruses, after a very careful calibration carried out with colleagues from Inaf and Int – explains Mara Biasin, professor of applied biology – and we found that a very small dose, 3.7 mJ / is sufficient cm2, ie equivalent to that delivered for a few seconds by a UV-C lamp placed a few centimeters from the target, to inactivate and inhibit the reproduction of the virus by a factor of 1000, regardless of its concentration “.

Not just UV-c rays, though. Because indirectly the results – clarify from the State University – validate “a parallel study to understand how the ultraviolet rays produced by our sun, as seasons change, can affect the pandemic”. The hypothesis, confirmed by the results, is that the rays can “inactivate in open environments the virus present in aerosol, contained for example in the very small bubbles produced by people when speaking or, worse, with coughing and sneezing. In this case – yes law on the Statale website – it is not the short UV-C ultraviolet rays, but the UV-B and UV-A rays, with a wavelength between 290 and 400 nanometers, therefore greater than the UV-C “.

The Statale writes:

In the summer, especially in the midday hours, the ultraviolet light of the sun can make the virus ineffective.

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The discovery on UV-c rays, and consequently on those of the sun, is important because – underlines Andrea Bianco, INAF technologist, “with such small doses it is possible to implement an effective disinfection strategy against Coronavirus. This figure will be useful to entrepreneurs and public operators – he concludes – to develop systems and implement ad hoc protocols useful to contrast the development of the pandemic “.

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