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.