Clinical information of patients included in this study.

*C. concisus strains were previously isolated from biopsies of patients No. 1 and No. 3 [9], [11]. The intestinal biopsies collected from patients No. 1 and No. 3 were from caecum and descending colon respectively, sampled from areas next to inflamed mucosa. C. concisus was detected in intestinal biopsies collected from patients No. 2 and No. 7 by PCR [11]. No intestinal biopsies were available from patients in remission. Patients No. 2, No. 5, No. 6 and No. 8 were being treated with anti-inflammatory drugs (infliximab, aminosalicylates, methotrexate or azathioprine) at the time of saliva collection. Patient No. 4 had ileocolonic resection and antibiotics treatment (metronidazone and ciprofloxacin) two years ago. None of the patients were receiving antibiotics treatment at the time of sample collection for this study.