Characterization of the Intestinal Microbiota in Patients With Inflammatory Bowel Disease and/or Spondyloarthritis and Study of the Impact of an Anti-TNF Alpha Therapy

14 ml whole blood for Peripheral blood mononuclear cell (PBMC) and monocytes isolation

Study of the fecal microbiota

food questionnaire on the seven days before the collection

Only for patients with ulcerative colitis (in routine care)

Volatile Organic Compounds (VOCs) profile obtained by mass spectrometry