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UVC Light and Covid-19

Date:Jan 22, 2021

What do we know about the airborne coronavirus?

It is now widely believed that the virus SARS-CoV-2 (Severe Acute Respiratory Syndrome, Coronavirus 2) that causes the coronavirus disease Covid-19 is airborne. When we cough, there are heavier water droplets spreading several meters away. However, there are smaller droplets that are invisible to the naked eye. These tiny droplets are between 60 nanometers (nm) and 140 nanometers (nm) in size. That's really small.


These tiny droplets were suspended in the air for several hours. In addition, if they are not affected by airflow or effective ventilation, they can remain in the air indefinitely. The harsh reality we face is that this deadly virus just lingers invisibly in the air we breathe. No surface disinfectant can change this situation.

Unfortunately, the simple masks that we are encouraged to wear will not block particles as small as the coronavirus. This is different from, for example, KN95 respirators, which have been shown to filter SARS-CoV-2. The purpose of wearing a simple face mask is to prevent larger infected droplets from spreading from the infected person. However, it cannot prevent uninfected people from inhaling particles in the air.

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Researches on 222nm far uvc light

Fortunately,the most famous recently is the team at Columbia University in New York, led by Dr. David J. Brenner. The team has applied for a patent to filter UVC to a narrow range of far UVC at around 222 nanometers.It cannot penetrate the surface of human skin or the outermost layer of our eyes, but they are still in the best position to effectively neutralize pathogens in the air and on the surface.

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These products can directly fight the coronavirus in the air we breathe. If used correctly, they can be used safely with people present,it will make an considerable contribution to the world.

 

Testing of 222nm far uvc light

Tests have shown that when seasonal influenza coronaviruses are exposed to extreme ultraviolet light at low levels much lower than 1.7 and 1.2mJ/cm2, more than 99.9% of the seasonal coronaviruses present in airborne droplets are affected with. This means they can no longer reproduce or cause infections.

Testing on humans has also been carried out.

A study conducted by researchers at Kobe University that they irradiated the backs of 20 healthy volunteers with 20-500 nmJ/cm2 of 222nm far ultraviolet light. Then, they assessed the induced erythema (redness of the skin).

The study found that even at high doses (up to 500 mJ/cm2), extreme ultraviolet light at 222nm would not cause any erythema to study participants. In addition, 222nm far ultraviolet light significantly reduced the bacterial colonies in the swab culture.


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