SAN ANTONIO As a face veil becomes an essential part of everyday life during a coronavirus pandemic, researchers are saying that some options may backfire.
Researchers from Duke University published a study on Friday that focused on currently popular masks and face veil and how effective they are in protecting people from infection.
They found cotton masks to be powerful, but bandanas were not much. With fleece collars, or scarves, those methods may not be as effective as not wearing a mask at all, or even worse.
“We found that speaking through some masks (especially the fleece in the neck) seemed to scatter the largest droplets into an infinite number of smaller droplets, which explains the apparent increase in number. drops versus no mask in that case, ”the study was published in the state journal Science Advances.
“Considering that smaller particles fly in the air longer than large ones (large droplets sink faster), using such a mask can be counterproductive.”;
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The researchers tested 14 different covers, including bandanas and surgical masks, knitted, rimmed N95, fitted with N95, cotton and fleece. Each option was tested 10 times.
The masked men spoke in the direction of the laser beam in a dark area. Any droplet that travels through a light-emitting laser beam is captured with a cell phone camera, the study says. The droplets are counted in a computer algorithm.
Research shows that levels of droplet transmission range from less than 0.1% when wearing an N95 mask to 110% with a fleece mask.
Surgical masks, cotton-polypropylene-cotton, and double-layered polypropylene aprons that followed the N95 fitted were most effective.
Although the experiment is very simple, it has its limitations, experts say.
“Variation between subjects can be expected, for example due to physiological differences, mask suitability, head position, speech pattern, etc.,” the study said.
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The co-founder of a jacket manufacturer, Vapor Apparel, told The Washington Post that the face masking option should not be completely removed.
“All gaits are not created equal,” says Chris Bernat of Vapor Apparel. “There is a segment of this category of much higher quality designed to be subclass.”
Research shows that knitting towels and knitted masks are the least effective types.
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