I suspect the delta variant only affects those that took the vaccine but there is no way to know for sure, you can't trust anyone. This is the first virus that I ever heard of that someone that had the vaccine could get sick from someone that didn't take the vaccine. At least that is what we were told. Of course we were also told shutting down for 14 days, wearing masks and washing hands would stop it. At this point, I trust catching it and getting over it more than any shot that has been proven not to work.