Hello Bradforde – welcome to Binkybunny!
First of all, welcome to Binkybunny, and thank you for the work that you do in rabbit rescue 
There was one bunny that had pasteurella at one of the rescues that I worked for, and he was a very happy and healthy bunny. From what I understand, as long as the pasteurella is managed with antibiotics, it is very easy for a bunny to live a happy life. One of the resuces I worked with would also bond the pasteurella bunnies, with the assumption that if the other bunny did happen to exhibit symptoms of the pasteurella, then it would be managed with antibiotics (I’m not sure what other’s opinions of this is, but the reasoning for it was that they did not want pastuerella bunnies to be totally isolated).
I do think it is important to wash your hands after petting this bunny so that you don’t pass the pasteurella to other bunnies, but I don’t think you have to totally isolate this bunny from the others (as in, he could probably be in the same area, just not in the same pen where he could be in contact with the other bunnies.
I don’t know how helpful that was, but I do think your little guy will be doing much better now that his abcess has been addressed, and now that he is safe with you instead of on the streets.