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but deep down we all know...From 18 July Wall Street Journal:
Face Masks Really Do Matter. The Scientific Evidence Is Growing.
New research suggests that face coverings help reduce the transmission of droplets, though some masks are more protective than others.[1]
Face masks are emerging as one of the most powerful weapons to fight the novel coronavirus, with growing evidence that facial coverings help prevent transmission—even if an infected wearer is in close contact with others.
Robert Redfield, director of the Centers for Disease Control and Prevention, said he believes the pandemic could be brought under control over the next four to eight weeks if “we could get everybody to wear a mask right now.” His comments, made Tuesday with the Journal of the American Medical Association, followed an editorial[2] he and others wrote there emphasizing “ample evidence” of asymptomatic spread and highlighting new studies showing how masks help reduce transmission.
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Researchers say the benefits of widespread mask use were recently seen in a Missouri hair salon, where two stylists directly served 139 clients in May before testing positive for Covid-19. According to a recent report[3] published by the CDC, both wore either a double-layered cotton or surgical mask, and nearly all clients who were interviewed reported wearing masks the entire time.
After contact tracing and two weeks of follow-up, no Covid-19 symptoms were identified among the 139 clients or their secondary contacts, the report found. Of the 67 who were willing to be tested, all were negative for Covid-19.
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Wearing a mask is “one of the most urgent things we can do to get our country under control,” said Melanie Ott, director of the Gladstone Institute of Virology. “We’re all waiting for the vaccine, we’re waiting for therapeutics, and we’re not there.”
“We have masks, we have social distancing, and we have testing,” she continued. “But there’s not much more in the toolbox here.”
1. https://www.wsj.com/articles/face-masks-really-do-matter-the...
2. https://jamanetwork.com/journals/jama/fullarticle/2768532
3. https://www.cdc.gov/mmwr/volumes/69/wr/mm6928e2.htm