UV Light: New Weapons Against Viruses

Did you know that ultraviolet (UV) light can be a powerful tool in fighting viruses? Scientists have been exploring different wavelengths of UV-C light to find safer and more environmentally friendly ways to prevent viral infections. For example, far-UV-C radiation with a wavelength of 233 nm can kill viruses on the skin's outer layer without harming deeper skin layers. This makes it a potential new method for treating skin infections. For disinfecting rooms, 275 nm UV-C LED lamps could be a better choice. Unlike traditional mercury vapor lamps, which are harmful to both people and the environment, these LED lamps avoid the use of toxic mercury.

Researchers tested how well different UV-C wavelengths inactivate viruses. They used a test with multiple viruses on various surfaces like stainless steel, PVC, and glass. They found that the amount of UV-C radiation needed to kill viruses depends on the type of virus. Enveloped viruses, which have a protective layer, are easier to kill than non-enveloped viruses. UV-C radiation at 233 nm can inactivate viruses at a dose of 80 mJ/cm². For a 4-log inactivation at 275 nm, the dose required varies. Enveloped viruses need up to 70 mJ/cm², while non-enveloped viruses need a maximum of 600 mJ/cm². This means that higher radiation doses are needed at 275 nm compared to the traditional 254 nm. So, 275 nm LED emitters could be a greener alternative to old mercury vapor lamps. And 233 nm radiation might be a useful addition to our arsenal against viruses, especially for treating skin infections.

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