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 6 feet from each other and checked to see how many coronavirus-sized particles spewed by one were inhaled by the other.The researchers found that wearing one mask — surgical or cloth — blocked around 40 per cent of the particles coming toward the head that was breathing in.
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