A safer UV light effectively Inactivates virus causing COVID-19, study shows

A safer UV light effectively Inactivates virus causing COVID-19, study shows

An in vitro experiment by HU researchers showed that 99.7% of the SARS-CoV-2 viral culture was “Inactivated” after a 30-second exposure to 222 nm UVC irradiation at 0.1 mW/cm2. The study is published in the American Journal of Infection Control.

A 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. This makes it a safer but equally potent alternative to the more damaging 254 nm UVC germicidal lamps increasingly used in disinfecting healthcare facilities.

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  1. Hiroki Kitagawa, Toshihito Nomura, Tanuza Nazmul, Keitaro Omori, Norifumi Shigemoto, Takemasa Sakaguchi, Hiroki Ohge. Effectiveness of 222-nm ultraviolet light on disinfecting SARS-CoV-2 surface contamination. American Journal of Infection Control, 2020; DOI: 10.1016/j.ajic.2020.08.022

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Far-UVC light safely kills ( or inactivate ) airborne coronaviruses

Far-UVC light safely kills ( or inactivate ) airborne coronaviruses

The researchers found that more than 99.9% of the exposed virus had been killed by a very low exposure to far-UVC light.

Based on their results, the researchers estimate that continuous exposure to far-UVC light at the current regulatory limit would kill 90% of airborne viruses in about 8 minutes, 95% in about 11 minutes, 99% in about 16 minutes, and 99.9% in about 25 minutes.

Manuela Buonanno, David Welch, Igor Shuryak, David J. Brenner. Far-UVC light (222 nm) efficiently and safely inactivates airborne human coronaviruses. Scientific Reports, 2020; 10 (1) DOI: 10.1038/s41598-020-67211-2

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