True story: I went to the doctor last week for a foot pain. In respect for the doctor, who is my friend, I had donned a mask - albiet one I made of thin black mesh like you'd use in a minnow net. The nurse took my vitals and clamped on a pulse oxygen meter. She frowed and said thats low, remove your mask. I said really? OK, and did. It jumped significantly to like 99 or something from in the 80s.
And that was using a fake mask made for oppressive ritual compliance only.
God knows what the nasty paper ones do after soaking for a while in spit.
Between the deadly gene therapies and filthy, oxygen depriving masks who needs a bug.... except perhaps a pack of genocidal megalomaniac hell bent on killing off millions of dumb compliant Americans...