In lab tests with dummies, exposure to potentially infectious aerosols decreased by about 95% when they both wore tightly fitted masks, a new @CDCMMWR…


In lab tests with dummies, exposure to potentially infectious aerosols decreased by about 95% when they both wore tightly fitted masks, a new @CDCMMWR finds. #WearAMask that fits tightly to your face to stop the spread of #COVID19. More: http://bit.ly/MMWR21021

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