> I read it, thanks. The mask they used was much better than what most people are wearing.

Can you give a citation for that? I think you might be in a strange place. Here nearly everybody wears surgical masks, most people were 2 : a surgical and cloth mask.

Also I'm interested in an experimental design or study design you would find acceptable. I saw your comments now on 3 papers showing evidence for mask wearing. It seems you are moving goal posts ever time.