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CDC now says masks protect both the wearers and those around them from Covid-19

Wearing a mask can help protect you, not just those around you, from coronavirus transmission, the Centers for Disease Control and Prevention said in...

Posted: Nov 11, 2020 2:13 AM

Wearing a mask can help protect you, not just those around you, from coronavirus transmission, the Centers for Disease Control and Prevention said in new guidance Tuesday. The statement was an update to previous guidance suggesting the main benefit of mask wearing was to help prevent infected people from spreading the virus to others.

Cloth masks act as "source control" to block virus particles exhaled by the wearer and provide "filtration for personal protection" by blocking incoming infectious droplets from others, the CDC said in its new guidance.

The new guidance cites a number of studies showing that masks reduce the risk of transmitting or catching the virus by more than 70% in various instances. One study revealed mutual mask-use helped prevent two infected hair stylists from transmitting the virus to 67 clients who were later interviewed. Another followed infected people who spent more than 10 hours on flights without infecting other passengers when masks were used.

In several scenarios, when officials told people to wear masks, infections and deaths fell significantly, the CDC pointed out.

"Adopting universal masking policies can help avert future lockdowns, especially if combined with other non-pharmaceutical interventions such as social distancing, hand hygiene, and adequate ventilation," the CDC said.

The agency cited an economic analysis that found a 15% increase in universal masking could prevent losses of up to $1 trillion.

"The relationship between source control and personal protection is likely complementary and possibly synergistic, so that individual benefit increases with increasing community mask use," the CDC said.

Some cloth masks are nearly as good as surgical masks at blocking droplets, the CDC said. Polypropylene may generate a static charge that captures particles, the CDC said, while silk might repel moist droplets and be more comfortable.

"Multiple layers of cloth with higher thread counts have demonstrated superior performance compared to single layers of cloth with lower thread counts, in some cases filtering nearly 50% of fine particles less than 1 micron," the CDC said.

"It's a two-way street," Dr. Anthony Fauci, National Institute of Allergy and Infectious Diseases director, said Tuesday on MSNBC. "You protect others, their mask protects you, and your mask also protects you."

Oregon Coronavirus Cases

Data is updated nightly.

Cases: 137600

Reported Deaths: 1877
CountyCasesDeaths
Multnomah29040464
Washington19216179
Marion16668247
Clackamas11989141
Lane8724113
Jackson712295
Umatilla697673
Deschutes517140
Yamhill329448
Malheur319855
Linn319449
Polk256340
Klamath252446
Josephine182636
Benton181714
Douglas175944
Jefferson173425
Union114617
Wasco111723
Columbia107518
Lincoln102717
Coos98315
Hood River97621
Morrow96310
Clatsop7075
Crook65213
Baker5825
Tillamook3692
Curry3245
Lake2485
Grant2171
Harney1806
Wallowa993
Gilliam531
Sherman470
Wheeler201
Unassigned00

California Coronavirus Cases

Data is updated nightly.

Cases: 3147735

Reported Deaths: 36846
CountyCasesDeaths
Los Angeles106550515184
San Bernardino2628581594
Riverside2585322777
San Diego2255582344
Orange2214932625
Santa Clara964351181
Kern89095590
Fresno847441043
Sacramento828611157
Alameda69693886
Ventura64404507
San Joaquin59395808
Contra Costa54416487
Stanislaus43938788
Tulare42759531
Monterey37285259
San Mateo33731340
San Francisco30027278
Santa Barbara26514264
Solano26494111
Imperial25562493
Merced25048324
Sonoma24761247
Kings19760160
Placer17675188
San Luis Obispo16437151
Madera13781151
Santa Cruz12687130
Marin11930163
Yolo11014138
Shasta9920129
Butte9711134
El Dorado800259
Sutter792783
Napa782847
Lassen526916
San Benito514348
Yuba504929
Tehama446846
Tuolumne344340
Nevada329674
Mendocino325635
Amador304232
Lake268132
Humboldt249425
Glenn198522
Colusa18549
Calaveras167223
Siskiyou148413
Mono11354
Inyo100729
Del Norte8732
Plumas6055
Modoc3873
Mariposa3464
Trinity3054
Sierra880
Alpine730
Unassigned00
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