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: https://t.co/gi3OLBCnWi. pic.twitter.com/Jt55LUECER

— CDC (@CDCgov) February 10, 2021