[Mo3]

My girlfriend has Crohn's disease that can be directly correlated to food poisoning while on vacation. Now years later I can't even count the times I've read and heard exactly the same story from other people with Crohn's disease. A simple search for "Crohn's food poisoning" turns up hundreds of results. I can't believe this is not being investigated with higher priority

[spondylosaurus]

Another comment in this post mentions reactive arthritis and HLA-B27; there's some evidence suggesting "permanent" autoimmune conditions in HLA-B27+ people also might come from viral triggers.

[emeril]

most of those with crohn's would likely have developed it at some point - 99% of those with food poisoning won't develop crohn's