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COVID-19: When should you wear a face mask? - Mayo Clinic News Network
Why you should wear your mask
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Coronavirus (COVID-19) Information Page
COVID-19 FAQs: Do we need to wear face masks? - Sanford Health News
Texas Department of State Health Services - Know when to mask up! My mask protects you. Your mask protects me. Masks are most likely to slow #COVID19 if everyone is wearing one.
Effectiveness of Face Mask or Respirator Use in Indoor Public Settings for Prevention of SARS-CoV-2 Infection — California, February–December 2021
Masks for COVID-19 protection, CITY OF KANSAS CITY
CDC Establishes COVID-19 Community Levels to Guide Masking
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