Wearing a properly fitting, N95 or KN95 mask can a reduce a person's likelihood of being infected from Covid by 83 percent, a and Prevention study reveals.The research team gathered data from over 2,000 people in who were tested for Covid from Febraury to December 2021.Participants reported their mask usage in the time preceding the Covid test - whether it was negative or positive - and whether they had a known exposure to the virus.
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