Crohn's disease: a bacterial component?

Crohn's is such a complex multi-system disease that it seems unlikely this is the entire story ...

BBC NEWS | Health | Bacterium 'to blame for Crohn's'

.... shortage of naturally-occurring bacteria is thought to trigger the inflammatory gastrointestinal disorder by over-stimulating the immune system.

Now a French team has highlighted the bug, Faecalibacterium prausnitzii, which they show secretes biochemicals that reduce inflammation.

The study appears in Proceedings of the National Academy of Sciences....

I'd have believed this more of Ulcerative colitis than of Crohn's disease.

I'm still impressed with how well worm infection seemed to treat ulcerative colitis, but it hasn't gone mainstream.