UV Light to Kill Coronavirus
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UV Light to Kill Coronavirus

Researchers from Hiroshima University found that using Ultraviolet C light with a wavelength of 222 nanometers can effectively kill the SARS-CoV-2 virus and is safe for use around humans. This is the first-ever research that proves the efficacy of Ultraviolet C light in killing the novel coronavirus.

Previous studies involving 222 nm UVC have only studied its efficiency in eliminating seasonal coronaviruses that are structurally similar to the SARS-CoV-2, but nor the novel coronavirus itself.

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A 30-second exposure to 222 nm UVC irradiation at 0.1 mW/cm2 was able to kill 99.7% of the SARS-CoV-2 viral culture in an in-vitro experiment by HU researchers. The American Journal of Infection Control published the results. The researchers used Ushio’s Care222TM krypton-chloride excimer lamp to conduct the tests.

They spread a 100 microliter virus solution onto a 9-centimeter sterile polystyrene plate. They placed the plates in a biosafety cabinet at room temperature to dry and then placed the Far-UVC lamp 24 centimeters above the surface of the plates.

UV Light to Kill Coronavirus

A wavelength of 222 nm UVC won’t cause harm to humans as it cannot penetrate the non-living, outer layer of the human skin or eye. This is an equally potent yet safer alternative to the harmful 254 nm UVC commonly used for disinfecting healthcare facilities.

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But 254 nm UVC can only be used to disinfect empty rooms since its harmful when exposed to human tissues. On the other hand, 222 nm UVC is a promising disinfection system for more occupied places where nosocomial infections are a possibility.

But further studies are required to confirm the effectiveness and safety of 222 nm UVC in killing COVID-19 viruses in real-world situations since the study was only done in vitro.

Hiroshima University scientists received funding from the Japan Agency for Medical Research and Development for four COVID-19 studies and the Far-UVC research was one among them.

Under the Hiroshima University CoV-Peace-Project, many laboratories are conducting research on the SARS-CoV-2 virus.

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