Health
Face shield is not a good mask alternative
The valved mask works as expected, delivering unfiltered droplets to the ambient air.
“Over time, these droplets can be spread over a large area, both laterally and vertically, despite the decreasing concentration of the droplets,” says FAU Professor Manhar. Dhanak said in a university statement.
The standard mask, on the other hand, did a much better job of containing the droplets-reducing the number emitted and limiting its spread. (The test includes “surgical” masks sold to the public and is not recommended for medical use.)
Research, published in journal September 1 Fluid physicsHas not tested the ability of face coverings to prevent infection with SARS-CoV-2, the virus that causes COVID-19.
In the real world, it depends on many factors, says Dr. Gregory Poland, an infectious disease specialist at the Mayo Clinic in Rochester, Minnesota.
The water droplets covering his face need to contain infectious viruses, and others need to expose the particles to a large enough “load” to infect the disease, he explains. did.
However, according to Poland, the drawbacks of face shields are obvious-also for wearers. “The air is drawn up and down,” he said. “you are Breathing Whatever is in the surrounding air”
Like Kara, Poland favors mask and shield combinations. But as a stand-alone, he said Face Shield was the “less successful option”.
Of course, cloth masks will only work if properly worn.
“Do not wear it under your nose,” emphasized Poland. Exposing your nose in public is “the most dangerous thing you can do,” he said.
Wearing a mask is important, but Kullar says that alone does not solve the problem. Keeping a physical distance from others, including outdoors, is still important.
“I don’t think I’m emphasizing the message enough,” Kullar said. “The risk is lower outdoors than indoors, but the risk is still there.”
WebMD News from HealthDay
Source
Sources: Ravina Kullar, PharmD, MPH, Adjunct Lecturer, David Geffen School of Medicine, University of California, Los Angeles, and Spokesperson, American College of Infectious Diseases, Arlington, VA; Gregory Poland, MD, Professor, Medicine, and Director, Vaccine Research Group, Mayo Clinic, Rochester, Minnesota;Fluid physics, September 1, 2020, online
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