I have converted to wearing a home-made mask in grocery stores, etc. This is my reasoning. Yes, a virus by itself will pass through a surgical or home-made mask. But the virus also resides in droplets emitted by sneezing and coughing. A home-made mask will catch the droplets, which are much larger than the virus itself.
There is also a line of thought that a large "dose" of virus leads to a worse outcome than a small dose. Seems to me a droplet would contain a large dose of virus, so at least I am avoiding that. It also reminds me not to touch my face.
Someone here posted a video of the "Fauci of South Korea," that convinced me. It's not a cure-all and I do not judge people who don't choose to wear a mask.
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