Who is denying here ?
There are multiple videos demonstrating hiw ineffective masks are.
Gee, I bet there are some showing how ineffective hands/elbows over your mouth is also, but? but?
You ppl can believe whatever suits you.... No one told you your mom's old bra made into a mask would protect your grandkids 100% from you so stop fuckin lying about it...........
Move the fuck on......
IT IS PREVENTATIVE, GO LOOK IT UP ON ONE OF YOUR CLIPS..........