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Jan 28, 2022 · The fibers in regular cloth or paper face masks filter out particles by physically blocking them—but the fibers in an N95 mask also use a great physics trick. These fibers are electrically...
- Overview
- Can contaminated face masks cause infection?
When the COVID-19 pandemic took off in 2020, so too did questions over the effectiveness of wearing a face mask to prevent the spread of the virus. Now, three and a half years later, what does the science say?
In an interview for 60 Minutes, CBS News chief medical correspondent Dr. Jon LaPook posed that question to Linsey Marr, a Virginia Tech university professor specializing in aerosol science.
"They are very helpful in reducing the chances that the person will get COVID because it's reducing the amount of virus that you would inhale from the air around you," Marr said about masks.
No mask is 100% effective. An N95, for example, is named as such because it is at least 95% efficient at blocking airborne particles when used properly. But even if a mask has an 80% efficiency, Marr said, it still offers meaningful protection.
•Indoor air systems crucial to curbing spread of viruses, aerosol researchers say
"That greatly reduces the chance that I'm going to become infected," Marr said.
Early in the pandemic, some guidance from health professionals suggested that wearing a mask might actually lead to infection: A person might encounter a contaminated mask and then touch their eyes, nose, or mouth. But research in the ensuing years has shown that fear to be misplaced.
"There wasn't any evidence really that that happens," Marr said.
Marr said her team aerosolized the coronavirus, pulled it through a mask, and then examined how much virus survived on the mask. The study reported some viral particle remained on some cloth masks, but no virus survived on the N95s or surgical masks.
Marr's team also touched artificial skin to masks and looked at how many virus particles transferred to the artificial skin. No infectious virus transferred.
"I hope the study kind of shows that it's something we don't need to worry about as much as we were told," Marr said.
The videos above were edited by Sarah Shafer Prediger.
Nov 1, 2023 · Fact Checked. Published on November 1, 2023. Wearing a mask in crowded indoor places can lower your chance of catching viruses. iStock. Yes, wearing a mask really does work to reduce the...
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Jan 15, 2022 · Cloth masks – encouraged earlier in the pandemic – can filter large droplets, while more effective masks, such as N95s, can filter both large droplets and the smaller aerosols or particles...
- 5 min
Feb 25, 2021 · “The KF94 [certification] standard is really close to our N95 standard,” he says. While the 3M N95 is the gold standard for health care workers in the U.S., several KF94 masks Collins tested performed better than N95 masks from brands other than 3M.
- A.C. Shilton
Jan 20, 2021 · In fact, some level 3 masks score impressively well on these tests, achieving filtration efficiency comparable to N95 (or KN95) respirators in the ultra-fine aerosols range (75nm / .075 microns).* The caveat? These are the pre-fit scores. Keep reading, or scroll to the fit section below. N95 Respirators.
Jan 19, 2022 · By Emma H. Tobin. Published 2:28 PM PDT, January 19, 2022. NEW YORK (AP) — Why is it better to wear an N95 than a cloth mask right now? Health experts suggest stepping up protection against the highly contagious omicron variant with stronger masks such as N95s or KN95s.
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