August 17, 2020

CDC: Masks with exhalation valves, vents don’t prevent spread of COVID-19

By: Judy Mathias
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Editor's Note

The Centers for Disease Control and Prevention (CDC) has updated its face mask recommendations, warning that masks with built in exhalation valves or vents aren’t effective in preventing the spread of COVID-19.

The purpose of masks is to keep respiratory droplets from reaching others. However, masks with one-way valves or vents allow respiratory droplets to be expelled out through the holes in the material and potentially spread the COVID-19 virus.


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