WDue to the lack of medical-grade masks and the very high need in hospitals and other care centers, many Americans are trying to delay the spread of COVID-19, from hand-sewn facial coverings to bandanas. , Looks at various other options. .. However, new research shows that not all masks are created equal when it comes to preventing viral infections.
In this study, Published in journal on Thursday rib cage, The researchers punched three different types of facial coverings: a single layer “seamless” mask, Specification From the US Centers for Disease Control and Prevention (CDC) and a three-layer surgical mask. A variety of facial covers were tested using LED lights, a high-speed camera, and healthy volunteers who were willing to be repeatedly stabbed with a tissue, and most often contained drops generated from speech, coughing, and sneezing. I have confirmed that. Containment suggests better efficacy in controlling infections.
“COVID-19’s pandemic and the need for community face masks raises the question of whether the scarf just needs to be held over the face or a better designed cross mask should be used,” said Global Biosecurity. Said Raina Mac Intyre, a professor at. University of New South Wales Sydney, and one of the authors of the study.
result? Surgical masks did the best overall work, but the two-layer CDC mask is “much better” than the one-layer cover because it contains droplets. However, the researchers added, “even a single-layer face cover is better than no face cover at all.”
The results were somewhat unsurprising. MacIntyre explains that surgical masks are made of multi-layer polypropylene with an outer layer of waterproof polypropylene and are regulated based on their ability to catch water droplets. Researchers also knew from previous studies that cloth masks with more layers generally performed better. “In practice, you probably need at least three layers,” says MacIntyre. Other factors such as material, design, fit and frequency of mask cleaning can also make a difference.
This new study Similar efforts last monthCommercially available cone-style masks and properly fitted quilted multi-layer homemade masks are great for containing respiratory splashes, with a “loosely folded face mask” and a bandana saying “minimal aerosolization. Provides minimal stopping function for the respiratory system. “
Still other studies need to be sufficiently clear about facial coverings. Research published in June found Musk obligations in the US states are associated with a rapid decline in the growth of daily COVID-19 cases, and it is estimated that Musk Rules have prevented up to 450,000 cases by late May. Different Investigation, Also announced in June, at least 95% of people predicted that the United States could avoid more than 30,000 coronavirus-related deaths from October by wearing masks in public. Another study We have found that wearing a mask can reduce the risk of infection from about 17% to about 3%.
Of course, if people don’t cover their faces from the beginning, the comparative effect of different types of face covers is not important. Mandatory mask rules have been issued in some cities and states, Many do not have, And the Trump administration was reluctant to issue a national power of attorney. This issue has been politicized throughout the United States and is probably best explained in the July 16 description of Georgia Governor Brian Kemp. Litigation Despite worsening statewide conditions, they are challenging Atlanta’s mask rules and other restrictions.
Nevertheless, most US voters registered now support statewide mask orders. Politician polReleased on Wednesday. If you’re dedicated to wearing a face cover to keep yourself and others safe, it’s important to know that pressing your face into a T-shirt may not cut it.
“The main message is that the design of the fabric mask is important. The more layers you have, the better it is with just one layer,” says MacIntyre. She recommends creating a mask with a water resistant fabric such as polyester for the outer layer. It is also recommended to have at least 3 layers to ensure a good facial fit. “Most importantly,” she adds, “always use clean masks and wash used masks daily.”
Coronavirus briefs. Everything you need to know about the global spread of COVID-19
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