COVID Examining the Efficacy of Virus Masks: CDC Findings

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Virus masks are shown to have a significant effect on reducing the risk of COVID-19 transmission, according to CDC findings. The CDC presentation outlines various studies that support the efficacy of masks in preventing infection. Evidence indicates that masks can reduce the spread of respiratory droplets, which are a primary transmission method for the virus. The discussion emphasizes the importance of mask-wearing in conjunction with other preventive measures. Overall, the findings suggest that masks are a valuable tool in controlling the spread of COVID-19.
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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Thread 'Magnetoreception in Animals'

Thread 'Magnetoreception in Animals'

For more than a hundred years people have been intrigued by how animals are able to do certain navigating tasks so well. Being able to sense magnetic fields has been one of several clues animals could use to figure out where they should go. Among possible magnetic sensory mechanisms have been: light sensitive proteins (cryptochromes) in the retina that can also react to magnetic fields. Microscopic magnetite crystals on found in various areas of the body (often the nose near nerves) A new...
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