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How Effective are Face Masks Against COVID Infection?
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- čas přidán 15. 08. 2024
- How effective are your face mask-wearing habits at reducing the spread of COVID? Risk Bites takes a look at the science of what works better, and when.
For more information and links to further resources, please do check out the links below.
This video was produced in collaboration with Dr. Lisa Brosseau at the University of Minnesota, who has led research on the relative impacts of different mask-wearing scenarios.
NOTES
This Risk Bites video draws on research by Dr. Brosseau and others on how different masks extend the time before the risk of infection becomes substantial when two people are in close proximity, and one has COVID.
The research builds on the Centers for Disease Control and Prevention guideline of a 15 minute “window of safety” when in close proximity to someone with COVID and no masks are being worn. However, it is important to realize that, while this 15 minute guideline is useful, it is not based on scientifically sound data, and so is more of a suggestion than a hard and fast rule.
What is important though is how this “window of safety” increases with different mask wearing behavior.
In this video we don't explicitly address the widely-used K95 masks. These are not to be confused with NIOSH approved N95 respirators. However, they do provide higher filtration efficiency than surgical masks, and most KN95s allow a better seal to be achieved between the mask and the face, if worn correctly.
However, an important factor in mask leakage is how the mask is held on. Ear loops such as those found on many K95s do not ensure a good seal - as anyone who has struggled with their glasses fogging up while wearing one will know.
Masks that use multiple bands that go round the back of the head typically allow a better seal to be achieved.
USEFUL LINKS
COVID-19 respiratory protection - resources from the University of Minnesota www.cidrap.umn...
How Face Masks Work (CZcams): • How Face Masks Work - ...
ACGIH COVID-19 Fact Sheet: Workers Need Respirators www.acgih.org/...
Information on respirator fit testing (NIOSH): www.cdc.gov/ni...
RISK BITES
Risk Bites videos are devised, created and produced by Professor Andrew Maynard. They are posted under a Creative Commons License CC-BY-SA
This video was devised and produced in collaboration with Dr. Lisa Brosseau
Backing track:
Sunny Breakfast, by Dominik Schwarzer. Used under license from Premium Beat www.premiumbea...
_____
ANDREW MAYNARD
Andrew Maynard is a scientist, author, and leading expert on risk and the ethical and socially responsible development and use of new technologies. He is an elected Fellow of the American Association for the Advancement of Science, serves as co-chair of the Institute for the Advancement of Nutrition and Food Science (IAFNS) Board of Trustees, is a member of the Canadian Institute for Advanced Research President’s Advisory Council, and has served on a number of National Academies of Sciences committees. He is a Professor in the Arizona State University School for the Future of Innovation in Society where he studies the future and how our actions in the present affect it.
More at: andrewmaynard.net
LISA BROSSEAU
Lisa Brosseau is a Research Consultant at the University of Minnesota, Center for Infectious Disease Research and Policy, and an Industrial Hygienist certified by the American Board of Industrial Hygiene and Associate Faculty of Occupational Hygiene in the British Occupational Hygiene Society. She is a leading expert on respiratory protection, aerosol measurement, filtration performance, and small business health and safety.
More at: www.lisabrosse...
#covid #facemask #respirator
What is the Covid-related mortality for non-elderly persons with no comorbidities?
We embarked on a very slippery slope when masks became obligatory. We live in a society where we take a risk anytime we leave our homes. Going from recommended to bullying people into wearing them did nothing to help whatever good they were trying to do.
I've never once worn one.
@@paulanderson7796 You did your own research?
That actually makes no scientific sense. It might make sociological sense. It might make emotional sense. But it makes no sense scientifically.
@@JohnnyArtPavlou Yeah? And neither do masks. And here we are, it’s almost 2023 and I passed a car yesterday with two people wearing them in their car. 😂
@@tbc9096 Don't worry about him. My reply to Johnny was this - " @JohnnyArt Pavlou Does the fact that I'm not dead make sense scientifically? I have degree level physics. I am very used to scientific principles and methods. "Science does not emanate from media"."
A great video - many thanks to both of you, Andrew and Lisa!
Now we have the Cochrane mask study. Hope we can put this all behind us now.
glad you mentioned time windows for viral infections which almost demolishes the social distancing argument in enclosed places with queues - higher 'comfort distances' - more time weighed - high chance of catching covid if after CDC 15 minutes.
I just want to know what % wearing a surgical mask reduces your change of COVID. Nobody seems to have done a simple study on this. You'd just need to get voluntary test subjects, divide them into mask-wearing and non-mask-wearing, and have a conversation with someone who is positive and infectious, then measure the incidence of COVID in group A vs. group B
But that would essentially be people signing up to get COVID
@@captainmarvel9328 sign a waiver, pay them, isolate them afterward.
also taking off your mask and coughing adjusts the efficiency of masks - as was common place during covid19
There are literally no studies that show masks to be statistically effective at keeping you from getting Covid.
There is like 1 study saying the person who is sick wearing a mask could be slightly effective.
This video is medical lysenkoism.
Can you see the air (oxygen) outside we all breathe? No
And can you see the virus? No
So if the virus is in the air (oxygen) then it's clear that both the air and virus cannot be seen because they're both invisible and since you're able to breathe through the mask then what makes anyone think that the virus isn't getting through your mask too. If it's invisible like the air?... if there even is a virus.
Masks are a lie and it's about control and that's fact.
can you link publications to what's told in your Video?
Click "more" and check out the Useful Links. Most references are in the CIDRAP article "What Can Masks Do, Part 1"
Just adding to Lisa's reply, here's the link to the article she mentioned: www.cidrap.umn.edu/news-perspective/2021/10/commentary-what-can-masks-do-part-1-science-behind-covid-19-protection
More in the blurb below the video!
I've read several studies. Masks are as effective as nothing. All these numbers are totally arbitrary.
Can you see the air (oxygen) outside we all breathe? No
And can you see the virus? No
So if the virus is in the air (oxygen) then it's clear that both the air and virus cannot be seen because they're both invisible and since you're able to breathe through the mask then what makes anyone think that the virus isn't getting through your mask too. If it's invisible like the air?... if there even is a virus.
Masks are a lie and it's about control and that's fact.
They are good for letting you know your breath is bad, that's it.
I wear none. My body, my choice
Lol fag
Although seen from the a real neutral but curious perspective: this video stated blatendly that there is no real science behind all of that, but then kept suggesting behaviours based on some "bumbers"? Wow. That's bold.
Love this Andrew. Thanks for really breaking down the science.
There is nothing remotely scientific about any of this.
Scientism
propaganda and lies
Notice how many times he mentioned natural immune response? Nor did I. This whole thing is a total sham. I've outright declined the so-called vaccines and haven't once worn a mask. "COVID" will go away when people stop pandering to it. There is nothing scientific about any of this "COVID" nonsense.
@@paulanderson7796 I've been wearing a mask when volunteering to feed the homeless. I'm gonna tell them no tomorrow. If they don't want my help I can volunteer somewhere else. I'll also make a scene and call them lysenkoists, paving the way for genocide.
@@travissharon1536 what's your point?
@@travissharon1536 That's a bit harsh. Why not carry on as usual but without the mask? I've never once worn one and have outright declined the so-called 'vaccines'.
@@paulanderson7796 If I'm confronted and told to wear a mask. On day 1 they told me I could leave if I didn't want to do it. I was just wanting to help people and did, but now I feel guilty for wearing it.
I've been volunteering for a couple months now, and I will play it by ear. I'm not looking for trouble, but I won't lay down if they try to force the issue.
The more bacteria trapped in your mask by exhaling, sneezing, coughing could be fatal.
Taking a sip from a glass that you drank out of hours before creates psychedelic bacteria that has proven to be fatal.
Oh brother! 🤮
Can you see the air (oxygen) outside we all breathe? No
And can you see the virus? No
So if the virus is in the air (oxygen) then it's clear that both the air and virus cannot be seen because they're both invisible and since you're able to breathe through the mask then what makes anyone think that the virus isn't getting through your mask too. If it's invisible like the air?... if there even is a virus.
Masks are a lie and it's about control and that's fact.
@I Stand Erected: I don't care if you believe it, Erected, and you sound as though you have made up your mind and are standing firmly on that, however home made double layer tightly woven cotton masks have been estimated to be about 70% effective against viral transmission, including Sars CoV2. How? Because larger droplets that contain millions of viral particles will likely hit a mask and can help prevent these blobs from reaching a person's mucosa in the mouth and nose. The number of viral particles at time of exposure is what determines the severity of Illness (it is called the "innoculum"). No one is saying that cloth and paper masks are 100% effective and that if you wear one that you will never get sick. However, wearing one can greatly reduce your chances of becoming seriously ill. You are free to research this a little further- Stanford did a study, and there are others, which have shown masks to be certainly helpful. Be well, but please stop spreading misinformation.
@@greenbeans575
If what I said doesn't make common sense to you and you still believe in liars I don't know what to tell you, I guess there's really no hope for you then.
Thanks for the info :)
All staff in hospital that I visited during October 22 wore face masks, including all visitors..yet a doctor on a home visit during November 22 when asked by me why are you not wearing a face mask, declared while coughing, I'm not wearing one unless they (presumably the government) tell me to. And this attitude while visiting an elderly patient..was elderly patient vaccinated..well, doctor did not ask..although doctor added he'd been to a concert recently and no one there was wearing one soooo. Previous health visitors all wore masks except Mr Arrogant.. Is he right or wrong?
He's right in my opinion.
Definitely right. We have vaccines, the world is normal again, there is no such thing as zero risk. The trade offs on universal masking is not worth the initial 5% reduction in cases.
@@stevebryan2446 I've outright declined the so-called 'vaccines' and have never once worn a mask. "COVID" will go away when people stop pandering to it.
Wrong.
@@paulanderson7796 Wrong what? I'm on your side.
What about the eyes? Does covid only enter through the nose? If it also enters through the eyes, wearing a mask alone means nothing, right? So if you're gonna promote masks, great, but why not fully promote both masks and eyewear in all mask promoting videos? Thoughts?
Not at all, they’re useless
Correction, anything aside from surgical n95 masks are useless, the n95s work very well
I suspect basic physics would beg to differ!
- Masks are a psychological visual symbol of our submissiveness to orders and nothing more - What the science and critical thinking empirically & unequivocally shows - - czcams.com/video/il-5HVmmMXE/video.html
@@riskbites Basic physics is calling you out. Covid is not a particle (Edwards 2021 et al), but an aerosol. Aerosols are not able to be caught by PARTICLE filters, especially face masks. 99% of the covid virons that are emitted by monkeys in the Edwards study were emitted as an aerosol. Masks used in a medical clinical setting are used to prevent body fluids from getting in the mouths of the staff and to prevent bodily fluids of the staff from entering open wounds etc of the people being treated. Mask packaging even have printed on them that they do not prevent exposure to virii. The testing on masks physically glues the masks to the dummy, and when glued provide only a 3% reduction in risk. Engineering solutions start at a 90% reduction. I don't know what a "fitted N95 masks" are but I am assuming you mean ventilators. Even HEPA filters used in isolation rooms in hospitals are not guaranteed to filter out virons, so they use a negative pressure system to exhaust all air in the room to the outside of the building to ensure prevention of contamination. There is a lengthy history of engineered solutions since the outbreak of legionnaires disease in "sick buildings". I give this video a 1 out of 10 for the fancy cartoons drawn. I take the 1 away for the shocking use of propaganda promulgated by the medical industry that is vying for funding from communist China or medical supply and pharmaceutical companies. Masks do not provide a lowering of symptoms like a placebo does and are known to cause over 40 pathological diseases and over 20 psychological conditions when used inappropriately, why was there no mention of these in this video?
@@riskbites You two should be ashamed of your inability to recognise obvious flaws in the "studies" that have called covid a particle or have made baseless assertions over non-existent data. There are a swathe of errors and outright lies inherent in the studies into masks (no control groups, assertions made from data that doesn't cover the assertion made, conflicts of interest) and any research scientist should have been able to pick these serious flaws before embarking on their propagandist pseudoscience. Industrial hygienists and engineers are not on your side and may your dodgy work get you cancelled, sacked and removed from positions of power in a timely manner. Anyone that watches this video and takes your advice is putting themselves in harms way.
This is no brainer info that I already knew before clicking this. Am i smarter than the average person? This is the first video i watched in my search to be educated but I haven’t learned anything. I personally dont want to wear a mask because only one of my nostrils work so my breathing is handicapped by default and made more difficult when wearing a mask. Unfortunately for me my job is at a hospital that mandates me to wear a face mask and I’ll likely be scolded if im spotted moving it down for much needed breathing of oxygen
Fake News Propaganda!
They do not work at all. Says all the studies on mail efficiency that were scrubbed from the internet before the pandemic
would like to ask the following scenario. If standard blue surgical masks used in period of lockdown we effective nursing stroke patient with NG tubes in and receiving nebulisers via electric atomiser pumps in enclosed space. An outbreak occurred and staff. Following a new patient transferred to the ward. Staff had been providing care using standard ppe mask plastic apron as no identified risk. 24 to 48 hours after Virus started to diagnosed in patients on the ward. Staff became ill following this and one staff unfortunately died other became quite ill. The reason I bring this up is staff effected and left with long conditions were finished from work. Fell of financial cliff government /nhs says you could of caught it anywhere. In truth most staff travelled to work and back in own cars. Those who couldn’t work hung out to dry. Claps and echo without substance.
YOU WERE LOCKED DOWN? LOL
@dirtsky exactly so if dealing with infected patients at work the stroke ward. And you get ill with covid where else are you picking it up from.
I call BS. My sister is an RT. Masks are used so you don't spit, sneeze, cough or puke on a patient or patient's wound.
⭐ p͎r͎o͎m͎o͎s͎m͎