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Coronavirus: Effectiveness of Face Mask or Respirator Use in Indoor Public Settings for Prevention of SARS-CoV-2 Infection — California, February–December 2021 | MMWR

Face masks or respirators (N95/KN95s) effectively filter virus-sized particles in laboratory settings
— Read on www.cdc.gov/mmwr/volumes/71/wr/mm7106e1.htm

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