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Sunshine may be really good at destroying the coronavirus, causing some interesting questions



itsnshine may be Achilles SARS-CoV-2. It has been known for some time that the coronavirus that causes COVID-19 is quickly destroyed on surfaces exposed to simulated sunlight, but a group of scientists now believe that this virus may be more susceptible to ultraviolet light than previously thought.

July 2020 An important study It was found that the simulated sunlight “rapidly deactivated SARS-CoV-2 on the surface”. According to their estimates, when exposed to simulated sunlight that represents sea level on a sunny summer day, 90% of the SARS-CoV-2 virus is inactivated every 6.8 minutes. The following month, another study produced a theoretical model that describes the solar inactivation of SARS-CoV-2.

However, according to research teams from the University of California, Santa Barbara, Oregon State University, the University of Manchester, and ETH Zurich, there are differences between these results. inside yourJournal of Infectious Diseases. They explained that laboratory experiments showed that sunlight inactivation was several times faster than theoretically predicted. In fact, in the experiment, the virus inactivation speed was more than eight times faster than theoretically predicted.

In order to explain this gap, they believe that we need to go beyond ultraviolet B (UVB) (high-energy ultraviolet rays related to skin burning) and begin to pay more attention to ultraviolet A (UVA) (the lower energy component of sunlight related to skin) . Ageing.

“The theory assumes that inactivation is achieved by causing UV-B to hit the virus̵

7;s RNA and cause damage to it,” Paolo Luzzatto-Fegiz, lead author of the Department of Mechanical Engineering at the University of California, Santa Barbara, said in a speech statement.

Luzzatto-Fegiz added: “People think that UV-A has little effect, but it may interact with some molecules in the medium.”

All of this is only a temporary guess.The researchers did not conduct any modeling or experiments for themselves, but only emphasized the special features The difference between data and theory.

Luzzatto-Fegiz added: “As a result, scientists don’t yet know what happened.” “Our analysis pointed out that additional experiments are needed to test the effects of specific light wavelengths and medium composition separately.”

If they have money, it will be a promising news.Some hospitals and other high-risk environments Disinfect their air Using the energy of UVC, the energy of UVC is even higher than that of UVB. however, This wavelength is largely absorbed by the earth’s ozone layer and does not reach the surface, which means it must be man-made.

Co-author Julie McMurry added: “UV-C is very suitable for hospital use. But in other environments, such as kitchens or subways, UVC interacts with particles to produce harmful ozone.”

On the other hand, UVA is safe and easy to generate Cheap LED bulbs that are many times stronger than natural sunlight. If UVA is actually the missing part of the puzzle, it can be easily implemented into air filtration systems and disinfection methods to slow the spread of COVID-19 in high-risk spaces.




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