Masks Rated, Best To Worst

Duke tested 14 types of mask or mask alternatives to find the ones that best reduce or stop transmission of coronavirus. (Emma Fischer / Duke University)

Aug 09, 2020 

New York Daily News – Not all masks are created equal.

Researchers at Duke University have tested 14 types of masks and other facial coverings and found that some are wanting when it comes to coronavirus protection, while others are quite good.

Using an easy-to-assemble laser and cellphone system, the team shined precise light onto the droplets emitted by someone wearing all varieties of mask, from none to the high-concept N95 that health care workers use.

The droplets people inadvertently spray out while coughing, sneezing, singing, shouting or even talking appear to be the most common form of transmission.

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The fewer of those we spew into everyone’s common air space, the lower the infection rate for SARS-CoV-2, which causes COVID-19.

Since as many as 40% of infected people don’t know they have it and can transmit the novel coronavirus to equally unsuspecting people they come in contact with, knowing what does and does not stop transmission is key, the researchers said. So is wearing a mask.

Study co-author Dr. Eric Westman, a physician at Duke, said in a statement:

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

There were a few surprises, most notably that pulling fleece over your mouth and nose is apparently worse than no mask at all.

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“We were extremely surprised to find that the number of particles measured with the fleece actually exceeded the number of particles measured without wearing any mask,” study co-author Martin Fischer, a chemist and physicist at Duke, told CNN. “We want to emphasize that we really encourage people to wear masks, but we want them to wear masks that actually work.”

Folded bandanas and knitted masks were not much better, the researchers said.

The best one turned out to be an N95 without the valve, the researches said, followed by three-layer surgical masks and the types of cotton masks that people have been making themselves … Read more. 


Inexpensive, Accessible Device Provides Visual Proof that Masks Block Droplets

August 07, 2020

Duke Health

DURHAM, N.C. – Duke physician Eric Westman was one of the first champions of masking as a means to curtail the spread of coronavirus, working with a local non-profit to provide free masks to at-risk and under-served populations in the greater Durham community.

But he needed to know whether the virus-blocking claims mask suppliers made were true, to assure he wasn’t providing ineffective masks that spread viruses along with false security.

So he turned to colleagues in the Duke Department of Physics: Could someone test various masks for him?

Martin Fischer, Ph.D., a chemist and physicist, stepped up. As director of the Advanced Light Imaging and Spectroscopy facility, he normally focuses on exploring new optical contrast mechanisms for molecular imaging, but for this task, he MacGyvered a relatively inexpensive apparatus from common lab materials that can easily be purchased online.

The setup consisted of a box, a laser, a lens, and a cell phone camera.

In a proof-of-concept study appearing online Aug. 7 in the journal Science Advances, Fischer, Westman and colleagues report that the simple, low-cost technique provided visual proof that face masks are effective in reducing droplet emissions during normal wear.

“We confirmed that when people speak, small droplets get expelled, so disease can be spread by talking, without coughing or sneezing,” Fischer said. “We could also see that some face coverings performed much better than others in blocking expelled particles.”

Notably, the researchers report, the best face coverings were N95 masks without valves – the hospital-grade coverings that are used by front-line health care workers. Surgical or polypropylene masks also performed well.

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But hand-made cotton face coverings provided good coverage, eliminating a substantial amount of the spray from normal speech.

On the other hand, bandanas and neck fleeces such as balaclavas didn’t block the droplets much at all.

“This was just a demonstration – more work is required to investigate variations in masks, speakers, and how people wear them – but it demonstrates that this sort of test could easily be conducted by businesses and others that are providing masks to their employees or patrons,” Fischer said.

“Wearing a mask is a simple and easy way to reduce the spread of COVID-19,” Westman said. “About half of infections are from people who don’t show symptoms, and often don’t know they’re infected. They can unknowingly spread the virus when the cough, sneeze and just talk.

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

Westman and Fischer said it’s important that businesses supplying masks to the public and employees have good information about the products they’re providing to assure the best protection possible.

“We wanted to develop a simple, low-cost method that we could share with others in the community to encourage the testing of materials, masks prototypes and fittings,” Fischer said. “The parts for the test apparatus are accessible and easy to assemble, and we’ve shown that they can provide helpful information about the effectiveness of masking.”

Westman said he put the information immediately to use: “We were trying to make a decision on what type of face covering to purchase in volume, and little information was available on these new materials that were being used.”

The masks that he was about to purchase for the “Cover Durham” initiative?

“They were no good,” Westman said. “The notion that ‘anything is better than nothing’ didn’t hold true.” Source.


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