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       #Post#: 2178--------------------------------------------------
       Effectiveness of Face Mask or Respirator Use in Indoor Public
       Settings for Prevention of SARS-CoV-2 Infection — Californ
   DIR By: Data Report
       Date: September 1, 2024, 11:49 pm
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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
  HTML https://www.cdc.gov/mmwr/volumes/71/wr/pdfs/mm7106e1-H.pdf
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