Takemasa Sakaguchi of the Hiroshima University Graduate School of Biomedical and Health Sciences were behind the study. Hiroki Kitagawa, Toshihito Nomura, and Hiroki Ohge of Hiroshima University Hospital's Department of Infectious Diseases, and Dr. The Far-UVC research is one of the four COVID-19 studies conducted by Hiroshima University scientists that received funding from the Japan Agency for Medical Research and Development.ĭrs. The researchers, however, suggest further evaluation of the safety and effectiveness of 222 nm UVC irradiation in killing SARS-CoV-2 viruses in real-world surfaces as their study only investigated its in vitro efficacy. But 222 nm UVC can be a promising disinfection system for occupied public spaces including hospitals where nosocomial infections are a possibility. Since 254 nm UVC harms exposed human tissues, it can only be used to sanitize empty rooms. This makes it a safer but equally potent alternative to the more damaging 254 nm UVC germicidal lamps increasingly used in disinfecting healthcare facilities. The researchers allowed it to dry in a biosafety cabinet at room temperature before placing the Far-UVC lamp 24 centimeters above the surface of the plates.Ī wavelength of 222 nm UVC cannot penetrate the outer, non-living layer of the human eye and skin so it won't cause harm to the living cells beneath. 5 × 106 TCID50/mL) was spread onto a 9-centimeter sterile polystyrene plate. A 100 microliter solution containing the virus (ca. Tests were conducted using Ushio's Care222TM krypton-chloride excimer lamp. ![]() ![]() The study is published in the American Journal of Infection Control. ![]() A nanometer is equivalent to one billionth of a meter.Īn in vitro experiment by HU researchers showed that 99.7% of the SARS-CoV-2 viral culture was killed after a 30-second exposure to 222 nm UVC irradiation at 0.1 mW/cm2. Other studies involving 222 nm UVC, also known as Far-UVC, have so far only looked at its potency in eradicating seasonal coronaviruses that are structurally similar to the SARS-CoV-2 but not on the COVID-19-causing virus itself.
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