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Home-made face masks likely need at least 2 layers to curb COVID-19 spread:
Home-made cloth face masks likely need a minimum of two layers, and preferably three, to prevent the dispersal of viral droplets from the nose and mouth that are associated with the spread of COVID-19, indicates a video case study published online in the journal Thorax.
[...] A team of Australian researchers therefore compared the effectiveness of single and double-layer cloth face coverings (175 g/m² cotton fabric, with a thread count of 170/ inch) with a 3-ply surgical face mask (Bao Thach) at reducing droplet spread.
[...] The video recording showed that the 3-ply surgical face mask was the most effective at reducing airborne droplet dispersal, although even a single layer cloth face covering reduced the droplet spread from speaking.
But a double layer covering was better than a single layer in reducing the droplet spread from coughing and sneezing, the recording showed.
This is just one case, added to which several other factors contribute to the effectiveness of cloth face masks, note the researchers. These include the type of material used, design and fit, as well as the frequency of washing.
Nevertheless, based on their observations, a home made cloth mask with at least two layers is preferable to a single layer mask, they say, adding: "Guidelines on home-made cloth masks should stipulate multiple layers."
And they emphasise: "There is a need for more evidence to inform safer cloth mask design, and countries should ensure adequate manufacturing or procurement of surgical masks."
Journal Reference:
Prateek Bahl, Shovon Bhattacharjee, Charitha de Silva, et al. Face coverings and mask to minimise droplet dispersion and aerosolisation: a video case study [$], Thorax (DOI: 10.1136/thoraxjnl-2020-215748)
(Score: 2) by DeathMonkey on Monday July 27 2020, @06:52PM (9 children)
Tell me about it! Do you have any idea how difficult it was to round up and murder 140,000 Americans and blame it on a fake virus?!?!?!?!
(Score: 0) by Anonymous Coward on Monday July 27 2020, @08:13PM (4 children)
a fake virus?!?!?!?!
No, 9 out of 10 Trump/Biden supporters agree, it's a China™ virus!
(Score: 2) by HiThere on Monday July 27 2020, @11:26PM (3 children)
There are 10 Trump/Biden supporters?
Javascript is what you use to allow unknown third parties to run software you have no idea about on your computer.
(Score: 0) by Anonymous Coward on Tuesday July 28 2020, @12:07AM (2 children)
After all the votes are counted, you will find there are over 130 million of them, roughly 65 million for each
(Score: 2) by deimtee on Tuesday July 28 2020, @07:13AM (1 child)
If you ask your questions carefully I think you will find that there are at least 120 million who are following Heinlein's advice - "even if you don't want to vote for any candidate, there's very likely someone to vote against".
If you cough while drinking cheap red wine it really cleans out your sinuses.
(Score: 0) by Anonymous Coward on Wednesday July 29 2020, @09:08PM
Yes, strategic voting... and Trump after Trump after Trump will always be the invariable result.
(Score: 0) by Anonymous Coward on Monday July 27 2020, @09:56PM (3 children)
This wasn't 140,000 but it was an awful lot:
https://babylonbee.com/news/ceremony-honoring-governor-cuomos-covid-19-response-to-be-held-at-now-vacant-nursing-home [babylonbee.com]
(Score: 0) by Anonymous Coward on Tuesday July 28 2020, @04:50AM (2 children)
Linking an item from a satire site [babylonbee.com] doesn't really bolster your point:
(Score: 0) by Anonymous Coward on Tuesday July 28 2020, @07:56AM (1 child)
I thought it was pretty obvious it's a joke site.
Thank you though for pointing it out to those too slow to immediately get the joke.
(Score: 0) by Anonymous Coward on Tuesday July 28 2020, @02:28PM
You're welcome.
The only problem is that the "joke" wasn't very funny. And I'm pretty easily amused.