I do know what I can share.
This article from NEJM that talks about Visualizing Speech-Generated Oral Fluid Droplets with Laser Light Scattering
https://www.nejm.org/doi/full/10.1056/NEJMc2007800
Why they used a damp cloth for this study I am not sure. But covering your mouth with a cloth does decrease the scatter of your spit. And you can theorize decrease the amount of virus you would spread.
And this video from our pulmonologist.
https://www.fox13now.com/news/corona...mask-questions
Also
A Medical Lab Scientists Katie Corley who showed coughing on a plate with and without a mask. This was just a run of the mill surgical mask.
https://uploads.tapatalk-cdn.com/202...68b804e02e.jpg
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