CDC changed its position on wearing face masks and now urges people wear them in addition to practicing social distancing and rigorous hand washing. They also urge people to use DIY masks or other alternatives so as not to impact the stock of N95 masks available for health care workers.
The reason for wearing masks in public is not to protect you, but to protect others from you, should you be infected but without symptoms (or with symptoms and not paying attention). It's having other people wearing masks that protects you from them.
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