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

JacksinPA

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https://www.washingtonpost.com/nation/2020/08/12/coronavirus-covid-live-updates-us/

The Centers for Disease Control and Prevention updated its website to warn against using masks with exhalation valves or vents to slow the spread of the coronavirus.

Masks with vents or valves “allow air to be exhaled through a hole in the material, which can result in expelled respiratory droplets that can reach others,” the CDC website now states. “This type of mask does not prevent the person wearing the mask from transmitting COVID-19 to others.”
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I've sen pix of these designs But don't have any in my stockpile.
 
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