COVID Examining the Efficacy of Virus Masks: CDC Findings

ElliotSmith
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Do virus masks have any effect on preventing infection from CV19?
Do virus masks have any effect on preventing or reducing risk of infection from CV19?

Have there been any studies on this?
 
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Here's a presentation from the CDC on the subject: https://www.cdc.gov/coronavirus/2019-ncov/downloads/science-of-masking-full.pdf

Here's an excerpt which summarizes their sources of evidence:
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