“In the 14 days before illness onset, 71% of case-patients and 74% of control participants reported always using cloth face coverings or other mask types when in public.” https://www.cdc.gov/mmwr/volumes/69/wr/pdfs/mm6936a5-H.pdf
“In the 14 days before illness onset, 71% of case-patients and 74% of control participants reported always using cloth face coverings or other mask types when in public.” https://www.cdc.gov/mmwr/volumes/69/wr/pdfs/mm6936a5-H.pdf
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