With regard to the Delta variant, certainly. But it surely has played a role in the subsequent known variants that have appeared as recently as the Olympics.
All of which contribute to our lack of herd immunity, or am I incorrect?
All of which contribute to our lack of herd immunity, or am I incorrect?
Towards your original point, only 15% of the world is vaccinated. Say even 5% extra could have been vaxed by now, a difference maybe but nowhere close to the order of magnitude difference required to drop mutation rate below multiple helpful ones per year