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Study shows N95 masks near-perfect at blocking escape of airborne Covid-19

160 点作者 robtherobber11 个月前

11 条评论

caleblloyd11 个月前
It always baffled me that the US government had a program to send everyone free COVID tests, but they didn’t have a program to send everyone free N95 masks, so we ended up wearing random materials that were far less effective.<p>With all of the mandates to wear a mask everywhere I at least would have liked to wear one that worked well. You would have thought if they could produce 6 free tests per household per month, they could produce 6 free N95 masks per household per month.
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instagraham11 个月前
&gt; the inexpensive “duckbill” N95 came out on top,<p>Inexpensive is not a word I&#x27;d use to describe a mask you need multiple of in a week and monthly replacements of thereafter. For a virus that affects the entire world, &quot;developing&quot; and &quot;developed&quot;, it&#x27;s not an easy sell.<p>But this rather harmless inference could&#x27;ve been promoted instead of the fake initial narrative of &quot;masks are not that useful, save them for medical staff&quot; that happened early on in the pandemic. Policymakers should never be gatekeeping information and acting like the public is too dumb to solve resulting supply-side issues.
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mitchbob11 个月前
Discussed recently (93 comments): <a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=40565561">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=40565561</a>
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Springtime11 个月前
This is an interesting comparison, as there was a NIOSH study in late 2020 (released in 2021)[1] that used equipment to measure procedure masks, surgical masks, proper disposable respirators (with exhalation valves, since that was the main focus of the study) and cloth face coverings and T-shirt fabric (latter two more representative of common DIY masks).<p>These were sealed shut onto the test equipment using wax (ie: perfect fitment, so best case scenario). They found a much higher penetration through the materials per se for cloth coverings and procedure masks.<p><i>&gt; Particle penetration through the surgical mask ranged from 2% to 17%. Procedure masks were most variable and ranged from 1% to 85%</i><p><i>&gt; For the six cloth face coverings, the submicron particle penetration ranged from 24% to 92%. For the two types of fabric from cotton t-shirts, submicron particle penetration ranged from 45% to 91%. Although this sample size was small, these penetration percentages for the cloth face coverings and fabric from cotton t-shirts are comparable to the 40% to 90% penetration found by previous NIOSH testing of cloth face coverings and fabrics.</i><p>For the respirators with exhalation valves their finding was the particle penetration was &lt;1% to 55% without any additional mitigation and under 5% when using the ECG pad mitigation strategy tested. Relevant since a common earlier critique (perhaps assumption) of valved respirators was they weren&#x27;t as decent as even common masks for non-wearers.<p>[1] <a href="https:&#x2F;&#x2F;www.cdc.gov&#x2F;niosh&#x2F;docs&#x2F;2021-107&#x2F;pdfs&#x2F;2021-107.pdf" rel="nofollow">https:&#x2F;&#x2F;www.cdc.gov&#x2F;niosh&#x2F;docs&#x2F;2021-107&#x2F;pdfs&#x2F;2021-107.pdf</a>
t0bia_s11 个月前
Studies with different conclusions:<p>Wearing face masks as a potential source for inhalation and oral uptake of inanimate toxins – A scoping review <a href="https:&#x2F;&#x2F;www.sciencedirect.com&#x2F;science&#x2F;article&#x2F;pii&#x2F;S0147651323013623" rel="nofollow">https:&#x2F;&#x2F;www.sciencedirect.com&#x2F;science&#x2F;article&#x2F;pii&#x2F;S014765132...</a><p>Physical interventions to interrupt or reduce the spread of respiratory viruses <a href="https:&#x2F;&#x2F;www.cochranelibrary.com&#x2F;cdsr&#x2F;doi&#x2F;10.1002&#x2F;14651858.CD006207.pub6&#x2F;full" rel="nofollow">https:&#x2F;&#x2F;www.cochranelibrary.com&#x2F;cdsr&#x2F;doi&#x2F;10.1002&#x2F;14651858.CD...</a><p>Possible toxicity of chronic carbon dioxide exposure associated with face mask use, particularly in pregnant women, children and adolescents – A scoping review <a href="https:&#x2F;&#x2F;www.cell.com&#x2F;heliyon&#x2F;pdf&#x2F;S2405-8440(23)01324-5.pdf" rel="nofollow">https:&#x2F;&#x2F;www.cell.com&#x2F;heliyon&#x2F;pdf&#x2F;S2405-8440(23)01324-5.pdf</a>
mozman11 个月前
More importantly, how’s it block the inhalation of covid?
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stuff4ben11 个月前
FWIW, now that N95 masks aren&#x27;t hard to get, I bought some a few months ago and holy crap they&#x27;re so much better than the KN95s I had to use during COVID. I basically went maskless at times because the KN95 mask just leaked so much that I couldn&#x27;t wear them. No matter how well I adjusted the metal nose bar, air leaked up when I breathed and it &quot;tickled&quot; my eyes so much I just stopped wearing them. I have since stockpiled a few hundred 3M N95s just in case.
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freitzkriesler211 个月前
About 3 to 4 years too late but cool to read nonetheless.
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Blackstrat11 个月前
Before you go drinking the kool-aid here, read the sponsoring list. Then go back and read peer reviewed studies on masks that occurred before the COVID pandemic. Or read the disclaimers on the masks. Bottom line, masks, even N95, offer limited mitigation. Numerous studies have demonstrated that. As for the vaccine, personally I know more people that died of vaccine side effects than died of COVID. In fact, I know exactly one person that was deemed a COVID death, despite dying of a hospital acquired staph infection. The government paid more for COVID deaths than dying with COVID. If you spent any time dealing with hospitals during the pandemic, the abuse was obvious. And since it&#x27;s an election year, it&#x27;s time to round the sheep up and scare them to death once again. Having lived through numerous pandemics down through the year and seeing how the sheep behavior was stimulated during COVID, my suggestion is that Fauci and the rest of his fascist cabal spend the rest of their lives rotting in jail, especially now that he has essentially admitted that he was making it up as he went along AND that the lab leak theory has gained more traction. Fool me once, shame on you, fool me twice, shame on me. Never again.
karol11 个月前
In females :D (check study)
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23B111 个月前
Here&#x27;s how the headline should read:<p>&quot;The right mask, worn properly, can do a nearly perfect job of blocking COVID-19&quot;<p>It&#x27;s incredible to me that after all this, we still write and publish declarative headlines and articles like this.
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