The CDC took nearly two years to formally recognize distinctions between masks for mitigating COVID-19 spread, finally saying in January that cloth masks offer “the least” protection and N95 respirators, which meet strict federal standards, “the highest.”
The agency’s slight nod to the largely symbolic value of cloth masks, predominantly worn in school settings, followed months of calls by onetime White House COVID advisers, among others, to promote masks actually designed to stop aerosolized transmission. It also spurred a run on N95s, sending prices skyward.
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