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 > 2019–20 CORONAVIRUS PANDEMIC POSTINGS

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BCSnob

Middletown, MD

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Posted: 04/26/20 02:34pm Link  |  Quote  |  Print  |  Notify Moderator

Do you understand that the cloth masks we are being told to wear are not intended to protect the wearer but are intended to protect everyone one else from the wearer?
CDC: How to Wear a Cloth Face Covering

CDC wrote:

CDC recommends wearing cloth face coverings in public settings where other social distancing measures are difficult to maintain (e.g., grocery stores and pharmacies), especially in areas of significant community-based transmission.

CDC also advises the use of simple cloth face coverings to slow the spread of the virus and help people who may have the virus and do not know it from transmitting it to others. Cloth face coverings fashioned from household items or made at home from common materials at low cost can be used as an additional, voluntary public health measure.



A cluster randomised trial of cloth mask........with medical masks in healthcare workers
Quote:

The rates of all infection outcomes were highest in the cloth mask arm, with the rate of ILI statistically significantly higher in the cloth mask arm (relative risk (RR)=13.00, 95% CI 1.69 to 100.07) compared with the medical mask arm. Cloth masks also had significantly higher rates of ILI compared with the control arm. An analysis by mask use showed ILI (RR=6.64, 95% CI 1.45 to 28.65) and laboratory-confirmed virus (RR=1.72, 95% CI 1.01 to 2.94) were significantly higher in the cloth masks group compared with the medical masks group. Penetration of cloth masks by particles was almost 97% and medical masks 44%.


* This post was edited 04/26/20 03:04pm by BCSnob *

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Tennessee

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Posted: 04/26/20 04:14pm Link  |  Quote  |  Print  |  Notify Moderator

Many questions have come up regarding UV light and the virus. The following sheds a lot of 'light' (pun intended) on the topic: UV Lamps and the Virus

BCSnob

Middletown, MD

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Posted: 04/26/20 04:22pm Link  |  Quote  |  Print  |  Notify Moderator

Far-UVC light: A new tool to control the........ of airborne-mediated microbial diseases

Germicidal Efficacy and Mammalian Skin Safety of 222-nm UV Light

neal10a

Madison CT

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Posted: 04/26/20 07:10pm Link  |  Quote  |  Print  |  Notify Moderator

There is nothing new about using UV for killing bacteria and viruses. It has and is being used for treating well water for years. I had a UV water system in a prior home I owned and it did a great job killing harmful bacteria. Sunlight contains UV and is limited or it would kill plants and animals if it had a higher concentration. Even its lower radiation level causes skin cancer for some people. Also it purifies mountain water streams as well, making it safer to drink directly from a high mountain stream. Many pioneers, trappers, Indians, and others new that. It makes it easier to understand that it could purify air handling systems as well.
Here is one vendor: https://www.skillingsandsons.com/blog/the-pros-and-cons-of-using-ultraviolet-rays-for-water-treatment

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Posted: 04/26/20 07:18pm Link  |  Quote  |  Print  |  Notify Moderator

The question is if it works on the current virus we are dealing with. The bottom line of the article states:
Quote:

"UV lamps should not be used to sterilize hands or other areas of skin as UV radiation can cause skin irritation," WHO says.

"You can catch COVID-19, no matter how sunny or hot the weather is. Countries with hot weather have reported cases of COVID-19," WHO added.


Which, or now at least, makes current 'fly by the night' statements about it's effectiveness on the Coronavirus invalid and may be helpful in keeping people from making serious mistakes.

BCSnob

Middletown, MD

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Posted: 04/26/20 07:23pm Link  |  Quote  |  Print  |  Notify Moderator

neal10a wrote:

There is nothing new about using UV for killing bacteria and viruses. It has and is being used for treating well water for years. I had a UV water system in a prior home I owned and it did a great job killing harmful bacteria. Sunlight contains UV and is limited or it would kill plants and animals if it had a higher concentration. Even its lower radiation level causes skin cancer for some people. Also it purifies mountain water streams as well, making it safer to drink directly from a high mountain stream. Many pioneers, trappers, Indians, and others new that. It makes it easier to understand that it could purify air handling systems as well.
Here is one vendor: https://www.skillingsandsons.com/blog/the-pros-and-cons-of-using-ultraviolet-rays-for-water-treatment


This is the new knowledge about uvc (from my second link above)

Quote:

We have previously shown that 207-nm ultraviolet (UV) light has similar antimicrobial properties as typical germicidal UV light (254 nm), but without inducing mammalian skin damage. The biophysical rationale is based on the limited penetration distance of 207-nm light in biological samples (e.g. stratum corneum) compared with that of 254-nm light. Here we extended our previous studies to 222-nm light and tested the hypothesis that there exists a narrow wavelength window in the far-UVC region, from around 200–222 nm, which is significantly harmful to bacteria, but without damaging cells in tissues.


Getting just this narrow region of the UVC wavelengths would require specialized equipment. The first link in my post above reported 222nm from an excimer laser killed H1N1 influenza virus.

* This post was edited 04/26/20 07:31pm by BCSnob *

neal10a

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Posted: 04/26/20 07:43pm Link  |  Quote  |  Print  |  Notify Moderator

Here is a fairly good source to understand UV stuff.

https://en.wikipedia.org/wiki/Ultraviolet

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Posted: 04/26/20 07:52pm Link  |  Quote  |  Print  |  Notify Moderator

The above is interesting reading, but does not contain any research related to the current virus. Also, be sure to read "Harmful effects" in the article.

As of now, if anyone has current research pro/con related to UV and the Corona Virus from any reputable research agency it is welcomed.

justme

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Posted: 04/26/20 08:10pm Link  |  Quote  |  Print  |  Notify Moderator

I can understand the necessity of confirming UV effectiveness with direct research. It is also interesting to note that NASA considers UV to be an effective virus killer because they utilized UV technology to sanitize the various landers that visit planets, moons, and asteroids.

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Posted: 04/26/20 08:14pm Link  |  Quote  |  Print  |  Notify Moderator

Because no one knows, yet anyway, if it has any effect on the current virus and misuse of UV can be deadly. Sanitizing mechanical components has no bearing on use on humans under the current circumstances.

* This post was edited 04/26/20 08:31pm by Moderator *

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