https://news.yahoo.com/masks-dont-just-protect-spreading-222346524.html
Erika Edwards and Tom Costello
,NBC News•November 10, 2020
Wearing a mask not only protects others from the spread of Covid-19, but it protects the wearer as well, the Centers for Disease Control and Prevention said Tuesday in its strongest messaging yet on face coverings.
The CDC also said that "adopting universal masking policies can help avert future lockdowns," particularly when combined with a doubling down of mitigation strategies available to virtually every American: physical distancing, hand washing and ventilation.
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The CDC report estimated that more than 50 percent of transmissions originate from asymptomatic people, or those who have been infected but have not yet developed symptoms.
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