CDC recommends double masks to help protect against COVID-19 - CBS News
CDC study finds 2 masks are better than 1 vs. COVID-19 - OPB
Are 2 Masks Better Than 1 at Preventing COVID-19 Spread?
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How to Double Mask Correctly - The New York Times
Double mask: Fauci says wearing 2 masks may offer more protection from COVID-19
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Double-Masking: Why Two Masks Are the New Masks - The New York Times
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CDC updates: Double masking and best mask guidelines
