Hi Sammy,
No, Crohn's is not contagious. It may be caused by genetics but it's not contagious.
If you have any other more specific questions let us know.
Best,
Elizabeth
No. Auto-immune diseases like IBD, MS, or Rheumatoid Arthritis are not contagious nor can they be transmitted through blood or other biological means. An auto-immune disease is like an allergy - it's when your body interprets a gene or a food as an invader and attacks its own cells.
You may be thinking of AIDS or HIV, which can attack the immune system and can be passed by blood, semen, etc.
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I understand Crohns is an auto-immune disease. Does that mean that the blood of a Crohns patient could pass the disease to another if there is a skin tear or open lesion?