Start United States USA — Art Face masks with valves or vents do not prevent spread of coronavirus,...

Face masks with valves or vents do not prevent spread of coronavirus, CDC says

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Of all the three-word phrases that this pandemic has popularized — “flatten the curve,” “six feet apart” — perhaps none has resonated as …
Of all the three-word phrases that this pandemic has popularized — “flatten the curve,” “six feet apart” — perhaps none has resonated as deeply as “wear a mask.” (Or, as Marco Rubio, the Republican senator from Florida, put it back in late June: “Everyone should just wear a damn mask.”) It’s one of the simplest and most effective ways to curb the spread of the coronavirus and save lives. But, as a burgeoning number of advisories makes clear, not every mask is helpful. In guidance updated late last week, the Centers for Disease Control and Prevention warned against wearing masks with exhalation valves or vents, a type of face covering made for hot and dusty construction work that has become a popular pandemic accessory because of its seemingly high-tech design. “The purpose of masks is to keep respiratory droplets from reaching others to aid with source control,” the agency’s guidance reads.

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