US 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.
The Centers for Disease Control and Prevention on Wednesday reported the results of a lab experiment that spaced two artificial heads six feet from each other and checked to see how many coronavirus-sized particles spewed by one were inhaled by the other.
They found that wearing two masks, like one cloth mask over a disposable surgical mask, can block up to 92.5 percent of infectious particles from escaping into the air.
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