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Masks work only if they fit well, and wearing two can ensure a tight fit. Eduardo Maquilón/Getty Images/Stringer via Getty Images News

CDC says masks must fit tightly – and two are better than one

How well your mask works depends on how well it fits. Wearing two snug masks made of different materials offers 95% protection from exposure to aerosols that could contain the coronavirus.
Although cloth masks have been widely adopted, many people still have questions about them. (Usplash/Vera Davidova)

COVID-19 masks FAQs: How can cloth stop a tiny virus? What’s the best fabric? Do they protect the wearer?

Epidemiologists reviewed 25 studies of cloth face masks. Here’s what they found out about how well they work, why they work, who they protect and why the mosquito and chain-link fence analogy is wrong.
Coughing, sneezing, talking and even just breathing can produce airborne particles that can spread SARS-CoV-2. Stanislaw Pytel/Digital Vision via Getty Images

People are getting sick from coronavirus spreading through the air – and that’s a big challenge for reopening

SARS-CoV-2 can be spread through the air. But just how much of a factor that is has been hard to determine. Recent evidence suggests it is common, posing problems as public places begin to reopen.
Evidence is growing that when masks are worn by nearly everyone, it can slow coronavirus transmission. AP Photo/Rick Bowmer

Masks help stop the spread of coronavirus – the science is simple and I’m one of 100 experts urging governors to require public mask-wearing

Recommendations around mask usage are confusing. The science isn’t. Evidence shows that masks are extremely effective to slow the coronavirus and may be the best tool available right now to fight it.
The guidance on masks appears to be shifting, but social distancing is still the key step people can take. Muhammad Fayyaz Rub/Shutterstock.com

Should we wear masks or not? An expert sorts through the confusion

The CDC is reconsidering its policy about the widespread public’s use of masks, as is the World Health Organization. Here are the facts about when it’s appropriate to wear a mask – and what kind.

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