Simple Test Shows Which Face Masks Are Best


By Steven Reinberg
HealthDay Reporter


FRIDAY, Aug. 7, 2020 (HealthDay News) — When it comes to face masks, not all are equally effective, a new study finds.

Duke University researchers developed a way of testing various types of masks to see which did the best job of stopping droplets coming from people’s mouths, preventing spread of the new coronavirus.

They relied on a makeshift apparatus consisting of a box, a laser, a lens and a cellphone camera.

“We confirmed that when people speak, small droplets get expelled, so disease can be spread by talking, without coughing or sneezing,” said Martin Fischer, a chemist and physicist at the Durham, N.C., campus. “We could also see that some face coverings performed much better than others in blocking expelled particles.”

What masks do the best job? That would be N95 masks without valves, followed by surgical or polypropylene masks.

Handmade cotton masks also stop a lot of droplets from normal speech, researchers said.

But bandanas and neck fleeces like balaclavas didn’t block saliva spray much at all.

“This was just a demonstration — more work is required to investigate variations in masks, speakers, and how people wear them,” Fischer said in a university news release. He added it demonstrates that businesses and others that are providing masks to employees or patrons could do similar testing.

“If everyone wore a mask, we could stop up to 99% of these droplets before they reach someone else,” said Dr. Eric Westman, an associate professor of medicine at Duke. “In the absence of a vaccine or antiviral medicine, it’s the one proven way to protect others as well as yourself.”

The report was published online Aug. 7 in the journal Science Advances.



WebMD News from HealthDay


Sources

SOURCE: Duke University Medical Center, news release, Aug. 7, 2020




Copyright © 2013-2020 HealthDay. All rights reserved.



Latest articles

Why Disney’s Smart House Is a Scary Movie For Adults

It took me a long time to realize why I'm afraid of Katey Sagal. The talented actor seems like a lovely person, but...

Stellar winds hint at how planetary nebulae get their stunning shapes

In their dying throes, some stars leave behind beautiful planetary nebulae — disk, spiral or even butterfly-shaped clouds of dust and gas (SN:...

MIT Trains Neural Network to Keep Patients Anesthetized During Surgery

Scientists at MIT and Massachusetts General Hospital have developed a new AI algorithm that can actually control an anesthetized patient’s level of unconsciousness...

Windows XP Source Code Got Leaked All Over the Internet

This week, we took an exclusive look at the chaos that unfolded inside Twitter in the hours after the accounts of Elon...

Related articles

Leave a reply

Please enter your comment!
Please enter your name here