Never bothered to dig into this before.
Researchers randomly assigned people to wear surgical masks or N95 masks. Then they tracked how many caught the flu. The results were very surprising.
smartairfilters.com
Difference not statistically significant. Confirmed by multiple studies. Some gave advantage to the cheap mask.
As a last resort, DIY masks provide more protection than nothing. Researchers tested household materials. These two materials captured the most particles.
smartairfilters.com
A doubled dishtowel works as well as the surgical mask material, 97% blockade of virus. Linen sucks. Plain cotton T Shirt isn't bad.
It is illogical that a badly fitted surgical mask with a gap big enough to stuff in your little finger, stops viral infections as well as a tight N95 mask. But it does empirically.
Obviously the protection is NOT from the
barrier to viruses. It's suggested that the point of the mask is to stop us from touching our faces, so if we just keep our hands in our pockets, it might work just as well.
I'm collecting some simple materials to see what we can make tomorrow. Dialysis nurse is going to need
something. I have my own supply of surgical masks, but they are limited. Could repurpose the material as filters, but I want a washable
reusable mask.
Definitely want an exhaust valve so at least breathing out is OK, and reduce water buildup in the filter, and foggy glasses.