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Researchers find 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.
Let's face it: Even as more people get vaccinated against Covid-19, everyone but small children will still need to wear a face mask for the foreseeable future.
U.S. government researchers found that two masks are better than one in slowing coronavirus spread, but health officials stopped short of recommending that everyone double up.