As new, highly transmissible variants of covid-19 spread across the U.S., health professionals have suggested that Americans wear two masks or upgrade to an N95. The difference is like getting two recommended doses of coronavirus vaccines instead of one — the additional mask offers more complete protection against the virus. Read more: https://wapo.st/39q4UBi. Subscribe to The Washington Post on YouTube: https://wapo.st/2QOdcqK

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