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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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