A valid question. And one which brings up a related one. Why the eff are we still wearing cloth masks well over a year into this? Surely it should have occurred to someone at some level that it would be more effective if we all wore kn94 masks or whatever the ones are that work well but aren’t full on n95 masks. Because of his underlying health risk SO started buying those almost a year ago and has consistently worn them since. At this point they should be strongly recommended and broadly available.