I understand that as long as you deworm the donkeys with ivermectin, then there is no worry.
I have had my donkey for years, he's fine, my horses are fine. I did make sure to worm him ivermectin at 2 week intervals for 6 weeks when I first got him and before I turned him out with my horses....just to be sure. I didn't quarantine him for 6 weeks just because of that though....the little stinker needed some brain surgery before he could go out with the herd.
"My biggest fear is that when I die my husband is going to try to sell all my horses and tack for what I told him they cost."