Researchers believe the lack of a specific bacterium in the gut may be a cause of Crohn's disease.

A 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.


CROHN'S DISEASE
Can affect any part of the gut
Most commonly affects the lower end of the small intestine - the ileum
Symptoms include, pain, ulcers and diarrhoea
Medication can relieve symptoms, but surgery to remove part of the gut may be required

The researchers, from the Institut National de la Recherche Agronomique, had already shown that patients with Crohn's disease have a marked deficiency in bacteria from the Clostridium leptum group.

Their latest work shows that F. prausnitzii - a major component of this group - accounts for a large part of the deficit.


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