Masks With Valves Don’t Stop COVID Spread

Not all face masks are equally effective. New videos show that masks with exhalation valves do not slow the spread of COVID-19. Exhalation valves are intended to make the masks more comfortable and easier to breathe through. However, they’re designed to protect the wearer from outside contaminants, not to protect others if the wearer has COVID-19.

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Source: HealthDay