Today the Centers for Disease Control and Prevention (CDC) released new data showing the fit of face masks—both cloth and surgical—can significantly reduce COVID-19 transmission, by as much as 96.5% if both infected and uninfected people wear them properly.

“What we know now is everyone needs to be wearing a mask when they are in public or inside with people from outside their households,” said Rochelle Walensky, MD, director of the CDC during a press briefing today.

“But many well-meaning people wear masks that do not fit well or fit incorrectly.”

New guidance comes with new data

To fix this, the CDC has published new images and guidance on mask wearing that show the optimal coverings: A surgical (or medical) mask knotted around the ears

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