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  3. Effectiveness of Face Mask or Respirator Use in Indoor Public Settings for Prevention of SARS-CoV-2 Infection — Californ

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

This report was posted on February 2022.


Source of information.

1. CDC

https://www.cdc.gov/mmwr/volumes/71/wr/pdfs/mm7106e1-H.pdf
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  3. Effectiveness of Face Mask or Respirator Use in Indoor Public Settings for Prevention of SARS-CoV-2 Infection — Californ
 


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