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Tag Archives: masks
There’s one mask type you really should avoid.
Read full story of excerpts below at Source: >One Chart Shows The Best And Worst Face Mask Types, Based on The Latest Research
“Disposable surgical masks are also made of non-woven fabric. A 2013 study found that surgical masks were about three times as effective at blocking influenza aerosols than homemade face masks (that was true, at least, when air flow was slower than a cough but faster than a human breathing during light work).
“Mask studies should be taken with a grain of salt
“Although research is coalescing around the idea that a few types of masks offer the best protection, it’s not always easy to simulate how a mask will perform in real life. That’s because only some tests directly mimic the size of novel coronavirus particles, while others evaluate performance based on viruses like influenza. Researchers also still aren’t sure about the degree to which the virus gets transmitted via aerosols, since those tiny particles are extremely hard to trap and study without killing the virus.
“Some scientists even have different ideas of what constitutes an aerosol – the generally accepted cutoff is less than 5 microns (that’s roughly the size of a dust particle) – and many experts think the delineation is arbitrary altogether.
“Different studies also test masks under different circumstances: Some mimic the heavy air flow produced when a person coughs, while others mimic the air flow when a person is talking or breathing normally. And of course, masks perform differently depending on how they’re worn. That’s why it’s better to stick with more protection over less.
Continue full story at source link above.
Are face shields more effective protection against the coronavirus than face masks? AARP asked the experts to explain the pros and cons of each.
Read full story of excerpts below at Source: >Pros and Cons of Shields for Protection from COVID-19
“One of the benefits of face shields is that they protect the entire face, including the eyes, which along with the nose and mouth can be a gateway for the coronavirus and other germs to enter the body. The plastic panel that hangs from the top of the forehead and extends below the chin prevents large respiratory droplets that are thought to carry the virus from reaching these areas of potential infection. Face shields also reduce the likelihood that you’ll introduce virus-packed particles on your own …They keep you from touching “your hands to your eyes and nose and mouth. If you’re wearing one, it’s pretty hard to do that”
“A recent JAMA report found that when community health workers added face shields to other protective equipment (face masks and gloves), COVID-19 infection rates among the workers dropped to zero. Similar findings have been published in The Lancet: Researchers looked at studies evaluating the effectiveness of nonpharmacologic interventions and found that eye protection was associated with a lower risk of virus infection. “Eye protection is typically underconsidered and can be effective in community settings,” the report’s authors write.
“It’s double protection,” Perencevich says about layering a face shield over a cloth face covering. “The face shield will protect the mask from being contaminated and then block additional droplets from your whole face, including your eyes.”
Continue full story with pros and cons at source link above.
The results are clear, surgical masks are superior
Full story of excerpts below at Source: >Scientists Test Which Masks Work Best by Filming People Coughing And Sneezing in Them
A surgical mask was the most effective at blocking droplets and aerosols from talking, coughing and sneezing. But if you can’t get hold of one, a cloth mask is the next best thing, and the more layers the better.
We confirmed that even speaking generates substantial droplets. Coughing and sneezing (in that order) generate even more.
In practice, we don’t yet know which has a greater effect — wearing masks to prevent infected people spreading to others or protecting well people from inhaling infected aerosols. Probably both are equally important.
Continue reading full story at source link above
The best way to find yourself is to lose yourself in the service of others.”
– Mahatma Gandhi
“NPR’s Ailsa Chang talks with Dr. Monica Gandhi of the University of California, San Francisco, about growing evidence that masks help lower the severity of the coronavirus for those who wear them.
Full story of excerpts below at source: >Growing Body Of Evidence Suggests Masks Protect Those Wearing Them, Too : NPR
“…they really are protective of you as an individual. And sort of putting it all together, it really is that the less virus that you get in, the less sick you’re likely to be. So not only do masks protect you – and we’ve seen from getting the virus and altogether.
“And that’s been seen in hamster studies. That’s been seen in a health care worker study that was just published last week in JAMA. But if you do get the virus in, you get very little in. And you’re likely to get what’s called an asymptomatic infection or not have any symptoms at all and – or a very mild infection.
it really looks like any country that has adopted universal mask wearing – and many, many countries have – even as they open up and they’re seeing each other more and there’s more cases, it has led to much, much fewer deaths or severe illness. So the idea about this virus is it’s completely bizarre how it can cause no symptoms in some people and very, very severe symptoms in others…even in settings where there are outbreaks but everyone masked, there’s, like, a 95% rate of not having symptoms at all
Continue full story at source link above.
“The “Boxes” are the walls in your mind.” — Pearl Zhu
Full Story of excerpts below at Source: >Are Face Shields or Face Masks More Effective at Preventing Coronavirus Spread? | PEOPLE.com
“When asked whether they work as well as more traditional face masks, Dr. David Edwards of Harvard University tells PEOPLE that there are “pros and cons” to the plastic coverings. Although they’re “particularly effective” at preventing large airborne respiratory droplets — which could result from a person nearby coughing or sneezing — they don’t do as good of a job with blocking smaller particles, as face shields don’t completely seal off the face. With smaller particles, they don’t travel like bullets, they hover in the air and below that face shield you’re still breathing in that air,” Edwards says.
“However, while face shields can be helpful, and certainly won’t hurt individuals who choose to use them, Edwards still recommends wearing masks — either alone, or in conjunction with the plastic coverings.
Continue full story at source link above.
“Wearing a mask in public is basically the norm these days (or at least, it should be). But let’s be real, surgical masks aren’t perfect. Namely, they can have a loose fit and allow potentially infected particles to get to your nose and mouth.
- Fold your mask in half
- Tie a knot with the ear loops on each side as close as possible to the mask
- Open up your mask
- There will be a little opening on the sides next to the ear loop, so tuck that in underneath the ear loops on each side
- Wear your (better-fitting) mask
They’re made of cotton. Or polyester. Or paper. Or polypropylene. Here’s what researchers say about the effectiveness of the different types of face masks during this pandemic.
Read full story at source: >A User’s Guide To Masks: What Types Offer The Best Protection? : Goats and Soda : NPR
“Face masks can also offer the wearer some protection — though how much varies greatly, depending on the type of mask. No mask will offer full protection, and they should not be viewed as a replacement for physical distancing of at least 6 feet from others, frequent hand-washing and avoiding crowds. When you combine masks with those measures, they can make a big difference.
“…consider the fabric itself. The tightness of the weave is really important. … To check your fabric, hold it up to a light: If you can easily see the outline of the individual fibers, it’s not going to make a great filter. Researchers say a thick 100% cotton weave is a good bet. That’s because at the microscopic level, the natural fibers in cotton tend to have more three-dimensional structure than synthetic fibers, which are smoother…That 3D structure can create more roadblocks that can stop an incoming particle
“Think multiple layers. Several studies have found that masks made of multiple layers are more effective at blocking small particles. A good option: a mask made of two layers of a thick-weave fabric with a built-in pocket where you can place a filter...The best bet for the material to slip in as a filter is polypropylene, which is derived from plastic.. “If you go to Walmart, you look for Oly-fun, which is the brand name of that fabric. It’s also called spunbond
“polypropylene is great as a physical filter but has another benefit: It holds an electrostatic charge. In other words, it uses the power of static electricity. Think of the static cling that can happen when you rub two pieces of fabric together, …That’s basically what’s happening with this fabric: That “cling” effect traps incoming — and outgoing — droplets. “That’s what you want — the cling is what’s important…And unlike other materials, polypropylene keeps its electrostatic charge in the humidity created when you breathe out
“Avoid masks with exhalation valves. Some cloth and disposable masks come with an exhalation valve at the front. The valve makes it easier to breathe out, but it also releases unfiltered air, so it doesn’t protect others if you’re contagious. And protecting others is the primary reason to wear a mask.
Continue reading much more of full story at link above.
New mask guidelines from WHO revealed.
Full story of excerpts below at Source: >Fabric Masks Need 3 Specific Layers to Effectively Block Coronavirus, WHO Says
“The guidelines, set to be released today, detail the type of fabric masks that are effective. They should have three layers: an inner layer that absorbs, a middle layer that acts as a filter, and an outer layer made from a non-absorbent material like polyester.
“Those layers in that order can “provide a mechanistic barrier,” … The guidance… is based on “new, novel research” commissioned by the WHO.
Fabric masks should also be cleaned and worn correctly, since contaminated hands can infect a person adjusting their mask or frequently taking it on or off,
The specifics of how to wear and clean them will be included in the soon-to-be-released guidance….And the organisation continues to emphasise that masks alone cannot defeat the coronavirus, and can lead to a false sense of security leading people to slack on other important prevention measures.