CDC weighs in on double-masking

WASHINGTON, D.C. (NBC) A new CDC report shows that double-masking can significantly improve protection from COVID-19.

Researchers ran experiments using dummies to assess how certain modifications could improve the fit of masks and reduce exposure to aerosols.

This includes wearing a cloth mask over a surgical mask as well as knotting the ear loops of a surgical mask and tucking in the sides.

The researchers found that wearing just one mask blocked 42% of the particles from a simulated cough but that jumped to 82% if a cloth mask was worn on top of a surgical mask.

Also, they found the knotting and tucking of the surgical mask reduced exposure to particles by about 65%. But the exposure was reduced by more than 95% if both mannequins were double-masked or wore the knotted and tucked surgical masks.

The CDC updated its website Wednesday to reflect the latest information.

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