Coronavirus: Do not use face masks with a vent or valve, CDC warns

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Coronavirus: Do not use face masks with a vent or valve, CDC warns​

Matthew Amlôt, Al Arabiya English Wednesday 12 August 2020

The US Centers of Disease Control (CDC) updated its guidelines on face mask use earlier this week to warn the public to avoid masks with exhalation valves or vents as the organization continues to recommend general face mask use in the fight against COVID-19.

Most health authorities in the world continue to state that nearly everyone, infected or not, should practice wearing masks in public to prevent the further spread of the coronavirus, which has already left over 740,000 dead globally.

“The purpose of masks is to keep respiratory droplets from reaching others to aid with source control. Masks with one-way valves or vents allow exhaled air to be expelled out through holes in the material. This can allow exhaled respiratory droplets to reach others and potentially spread the COVID-19 virus,” the CDC explains on its site.
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I thought this was interesting because I do see a number of persons wearing the masks with a valve. I never would have thought those would be worse to wear.

Example:
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Some masks that look similar to that have replaceable filters within them.
 
Those are generally one-way exhalation valves. While it is beneficial to the wearer’s comfort, it renders them useless in the context of Covid. The hospital where my physician sister works doesn’t allow them.
 
Scarves are bad, the research found too.
 
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