Chronic inflammatory bowel diseases such as Crohn's disease or ulcerative c
olitis, affect around 1 in every 1 000 individuals in western countries. Th
ey probably result from an inappropriate reaction towards the commensal mic
roflora and are currently treated with antiinflammatory drugs or surgery. N
ovel strategies aim at blocking lymphocyte recruitment and activation, impr
oved targeting of therapeutics and modification of gut microflora. (C) 2001
Editions scientifiques et medicales Elsevier SAS.