Explorative investigation to study the effect of the endogenous bacterium Lactobacillus reuteri ATCC PTA 4659 as a nutrient additive against relapse in ulcerative colitis. Forty patients will be studied with a randomized parallel design over one year. Patients with established treatment against relapse of ulcerative colitis with mesalazine ≤4 grams will be requested to participate in the study, allocated to 20 patients with placebo and 20 with active treatment L. reuteri as an "add-on". Inklusion: 18-80 years of age, ≥1 relapse with bleeding during previous 12 months with a disease activity Mayo Clinical Score ≤2, treatment with mesalazine ≤4,0 g daily. Exklusion: \>80 years of age, no registered bleeding during recent 12 months, on-going steroid treatment, immunosuppressives, biologics or adhesion inhibitors, antibiotics or other clinical trial. behandling med probiotika. Disease monitoring will be done with: Time to disease relapse with macroscopic bleeding and Mayo score ≥5, blood chemistry and CRP, lipopolysaccharides and gut permeability, fecal calprotectin, and short health scale at 4 weeks, 26 weeks and 52 weeks.
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Rectal bleeding with Mayo score ≥5
Timeframe: 12 months