Covid-19 may be neutralized by sunlight, - research

Source : 112 Ukraine

Scientists say that sunlight, high humidity and temperatures above 20 degrees Celsius noticeably reduce activity of causative agent of the disease
20:39, 29 April 2020


The new coronavirus is rapidly destroyed by sunlight. This is the conclusion of U.S. scientists who released results of their survey. At the same time, this study has not yet been reviewed and is awaiting an external evaluation.

William Bryan, Science and Technology Advisor to the Secretary of the Department of Homeland Security told White House reporters government scientists have discovered that ultraviolet rays have a strong effect on the pathogen. This conclusion gives hope that the spread of coronavirus can weaken during the summer.

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“Our most striking observation today is the powerful effect of sunlight on the destruction of the virus both on the surface and in the air. We observed a similar effect with both temperature and humidity, when the increase in temperature and humidity or both is usually less favorable for the virus," he said.

Brian showed that the half-life of the virus was 18 hours, when the temperature ranged from 70 to 75 degrees Fahrenheit (21 to 24 degrees Celsius) with 20 percent humidity on a non-porous surface. These are, for example, surfaces such as door handles and stainless steel.

But the half-life was reduced to six hours, when humidity increased to 80 percent, and to two minutes, when sunlight was added to the equation. When the virus was aerosolized, that is, suspended in air, the half-life was one hour at a humidity of 20 percent and a temperature of 21 to 24 degrees Celsius. In the presence of sunlight, this value decreased to one and a half minutes.

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Viruses are believed to decompose faster on hotter surfaces, because the protective layer of fat that surrounds them dries faster.

Brian concluded that summer conditions "will create an environment in which transmission of coronavirus can be reduced." However, he added that reducing the spread does not mean that the pathogen will be completely destroyed.

As we reported before, in Ukraine, 9,866 cases of infection with coronavirus spotted. 456 cases were spotted during the past 24 hours


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