Subtropical Island
Senior Member (Voting Rights)
Exactly.UV (and fresh air) definitely helps general disinfection, but how much it does for this particular virus is the question.
I’m very conscious that bacteria are quite different to viruses.
(My child brain remembers it as viruses are like code-carrying drones whereas bacteria are small life forms - easier to kill a life form with extremes of temperature etc ...but bacteria can reproduce and viruses need a host to replicate). And then there are things like fungi too. Microorganisms are many and varied.
"
All this means that using sunlight to disinfect surfaces is extremely problematic.
First of all, no one knows how long it takes to deactivate Covid-19 with sunlight, or what strength is needed. And even if they did, the amount of UV in sunlight varies depending on the time of day, the weather, the season, and where in the world you live – especially which latitude – so this wouldn’t be a reliable way to kill the virus. "
https://www.bbc.com/future/article/20200327-can-you-kill-coronavirus-with-uv-light
From your quote (good for a public statement but not quite what I was looking for)
and the fact that it’s just the BBC (media are often bad at this)
I was at first reluctant to read your link but
(thank you for it and apologies for doubting you)
these parts are very good:
(bold is mine)There is also a third type: UVC. This relatively obscure part of the spectrum consists of a shorter, more energetic wavelength of light. It is particularly good at destroying genetic material – whether in humans or viral particles. Luckily, most of us are unlikely to have ever encountered any. That’s because it’s filtered out by ozone in the atmosphere long before it reaches our fragile skin.
If you’re skimming through you should know:
However, the vast majority of the UVC lamps on the market don’t use far-UVC yet – and again, it hasn’t been tested in actual humans, just on our cells in petri dishes and other animals. So this type of radiation probably won’t help you during the current pandemic either.
It does go on to talk about sunlight
and essentially says it’s possible that it might help, especially in water exposed to light (because peroxide),
but, even if it did have a significant effect, it would be very slow.
So I conclude that, for this current virus, just leaving things alone for a few days is more important than sun. (Although, of course, it’s still helpful for basic hygiene involving other micro-organisms)
and I’m left still not knowing much about UV and viruses
except that UV in general is a pretty blunt and weak instrument for a virus.
Specialist lamps maybe (using strong UV and including UVC, preferably far UVC for safety) but, in general, UV isn’t especially great at deactivating/destroying viruses.
[edited for punctuation and clarity]
ETA: NB the source for the article was Dan Arnold who “works for UV Light Technology, a company that provides disinfecting equipment to hospitals, pharmaceutical companies and food manufacturers across the UK.”
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