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[ad_1] NIOSH-approved N95 mask are really useful to forestall the transmission of the COVID-19 omicron variant. Jennifer Swanson/NPR cover caption toggle caption Jennifer Swanson/NPR NIOSH-approved N95 mask are really useful to forestall the transmission of the COVID-19 omicron variant. Jennifer Swanson/NPR After months of public well being professionals urging American citizens to start out dressed in upper high quality mask, the Facilities for Illness Keep an eye on and Prevention on Friday up...