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You can do your part to slow the spread of COVID-19 by wearing a well-fitting face mask that does NOT have an exhalation valve, and this video shows why. My mask protects you. Your mask protects me. Masks that the CDC recommends for slowing the spread of the novel coronavirus are mainly meant to protect people other than the wearer by catching exhaled droplets that might contain the virus. But masks with exhalation valves allow that breath (and its respiratory droplets) to escape unfiltered. Wit
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