...the virus keeps evolving. But the more people are vaccinated, the less opportunity the virus has to mutate.

Dr. Michael Dobbs says that the host of the virus is primarily unvaccinated people. When the virus is inside an unvaccinated body that doesn’t have the immunity provided by the vaccine, there's a chance it can reproduce and change - creating a mutation.

"If the mutation happens to be something that's favorable to the virus transmitting, then that type of virus, that strain, will take over and become the most dominant one eventually and that's what we're seeing with the Delta variant,” Dr. Dobbs said.

https://www.krgv.com/news/unvaccinated-individuals-creating-covid-mutations-health-expert-says/