Effectiveness of Face Mask or Respirator Use in Indoor Public Settings for Prevention of SARS-CoV-2 Infection — California, February–December 2021
This report describes face mask or respirator effectiveness in helping protect against COVID-19 infection.
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PDF) Effectiveness of Face Mask or Respirator Use in Indoor Public
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The effect of activity and face masks on exhaled particles in
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High rates of observed face mask use at Colorado universities
