Covid News Around the World One Year Later

[rcathey]

...specifically told by the medical professionals who treated them that it was because of mask wearing.

I believe you did post that anecdote here.

I was more interested in learning about the mechanism behind it. Blame the engineer in me but I'd really like to know how that works. On face value, when reading that masks make healthy people sick, I think, "Ok...but why?"
Was wondering if someone had read a medical study on the subject they could share.