Think about this, per the CDC, everyone whether vaccinated or not can transfer the COVID virus (for the Delta variant and all new variants). Therefore, whether you have been vaccinated or not, anyone can transfer the new strains. Hence, a reason why my work requires all folks to where mask whether vaccinated or not. So, as you can see, being vaccinated doesn't protect anyone from anyone. A vaccinate person can infect a non-vaccinated or vaccinated all the same. The vaccines need to be updated much like the flu vaccine is updated yearly.