Masks are moderately effective (70 to 90%) in short-term risk situations such as grocery store shopping to prevent the spread of Covid to strangers.
In longer term situations such as classrooms and offices where people in the space breath the same air for six to eight hours, their effectiveness is near zero.
Link?
it’s near zero in grocery store as well. It may even enhance the spread
“Masks are moderately effective (70 to 90%) in short-term risk situations such as grocery store shopping to prevent the spread of Covid to strangers.”
I’d LOVE to see the evidence. Because what I cannot get around is this: In states that have required masks to stop the spread of COVID, the virus doesn’t even slow down. It doesn’t even make a hiccup in the spread.
Incubation period is 5 days on average. It would then take perhaps a week for the numbers - data tracking - to show a genuine cut. No reason why it would take over 15 days to show results. And in state after state, that has not happened. Not even in 30 days.
We now have TONS of evidence on how effective masks are at cutting the spread of the virus in the real world, using what is now well-over 50 million people in the experiment.
AND IT FAILED!