Double masking can block 92% of infectious particles, CDC says

Double masking can significantly improve protection, new data from the US Centers for Disease Control and Prevention shows.

Researchers found that layering a cloth mask over a medical procedural mask, such as a disposable blue surgical mask, can block 92.5% of potentially infectious particles from escaping by creating a tighter fit and eliminating leakage.
"These experimental data reinforce CDC's prior guidance that everyone 2 years of age or older should wear a mask when in public and around others in the home not living with you," CDC Director Dr. Rochelle Walensky, told a White House briefing.
"We continue to recommend that masks should have two or more layers, completely cover your nose and mouth, and fit snugly against your nose and the sides of your face," said Walensky
Source: Enriquez, Keri, February 11, 2021, Double masking can block 92% of infectious particles, CDC says, Retrieved from CNN