I don't know my bro in law's a Los Angeles fireman and he says restricitons on blood donation/supply vary by state. Apparently for anyone with an automimmune disease, if our blood or organs are introduced into a person with no Crohn's antibodies it can cause severe infection.
My doctor made it sound like, "It's common knowledge, duh" when I discussed it with him as I was interested in being on a donor list for organ transplantation.
On a related note:A family friend received a live tissue transplant for knee replacement. He developed non-Hodgkins lymphoma; apparently his donor had died in a car accident, and even though she didn't have lymphoma, she was months away from it developing. The only any of this came to light is because the family is super rich and had a full investigation for the wrongful death lawsuit they filed after he passed.
Scary! We all definitely need more info on this; great question chrisnsteph-thanks for posting or many of us wouldn't have given it a second thought.:thumright: