It's time to upgrade your mask, doctors say.
Mask mandates dropped across the U.S. in recent weeks as a winter surge of Covid-19 infections subsided. But now, an easily transmitted version of the Omicron coronavirus variantThe earlier Omicron wave had doctors and public-health officials warning that the popular
might not offer enough protection. They recommended people choose stronger options like N95s or other high-filtration face-coverings.
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