Study shows first proof that a safer UV light effectively kills virus causing COVID-19

[sl8]

https://www.hiroshima-u.ac.jp/en/news/60119

Study shows first proof that a safer UV light effectively kills virus causing COVID-19

By Hiroshima University Department of Public Relations

Researchers offer first proof that Ultraviolet C light with a 222 nm wavelength — which is safer to use around humans — effectively kills the SARS-CoV-2 virus.

A study conducted by Hiroshima University researchers found that using Ultraviolet C light with a wavelength of 222 nanometers which is safer to use around humans effectively kills SARS-CoV-2 — the first research in the world to prove its efficacy against the virus that causes COVID-19.

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. A nanometer is equivalent to one billionth of a meter.

An 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. The study is published in the American Journal of Infection Control.

[...]

Link to study in American Journal of Infection Control:

https://www.ajicjournal.org/article/S0196-6553%2820%2930809-9/fulltext

[niyad]

1. KNR

[flamin lib]

2. Good news. nt

[Laelth]

3. Yeah, OK.

But does the bulb still have to be installed anally, or is there a more comfortable method?

-Laelth

[LiberalArkie]

4. But will UV-C light up the posters like the old black lights?

[BComplex]

5. Ok. So where does one acquire such a light?

A 222nm UVC? Is there an abundance of these? Are they hard to manufacture? What's the story?

[RainCaster]

6. Now I understand why DFT wanted a UV suppository

I'm not ready for that myself.

[hunter]

7. The market is already flooded with fake virus killing UVC lamps...

... that don't produce 222 nanometer ultraviolet.

Most ultraviolet LEDs, especially the inexpensive ones, produce something closer to violet than UVC. They'll make Halloween decorations glow but they won't effectively kill coronavirus. Common clear mercury vapor tube ultraviolet lights produce UVC light that's dangerous to eyes and skin.

BTW, here's a link to the AJC article that works"

https://www.ajicjournal.org/article/S0196-6553%2820%2930809-9/fulltext

[sl8]

8. Yes, and there are also other, actually germicidal, UVC lamps available

Germicidal UVC lamps have been used for a while and were readily available, pre-covid at least, but they weren't 222 nm and not considered safe for human exposure. Typically, the light was shielded or intended for use in environments emptied of people.

As you say, fakes abound. Worse, most end-users dont have any way of confirming the safety and efficacy of their purchase, beyond the reputation of the manufacturer or reviewers.

Thank you for the fixed link, adding to OP.