Originally Posted by
MarcK
I find that a mask on the other person is more like 90% effective in reducing airborne particles. If we both wear masks thats 1-(1-.0,9)(1-0,9) or 99% reduction between us.So, as an old guy, I prefer those odds, and I'm willing to wear a mask to prevent transmission to others in the event I am Covid positive, even being vaccinated.
No, it's not 90%. That's literally fake news. Masks are
not some magic bullet to prevent transmission - far from it in fact.
There have been numerous studies of masking vs. Covid transmission rates. The
best they found was a 12% reduction in transmission with masks vs. unmasked. Most showed less than 10% reduction.