Faecal Analyses in Rheumatoid Arthritis Therapy

This study evaluates the intestinal microbiome and disease activity in patients with rheumatoid arthritis receiving immunosuppressive therapy. Patients will be analysed at two time points in reference to two predefined primary endpoints: * Changes in intestinal microbiome * Response to therapy The investigators want to evaluate if successful treatment of rheumatoid arthritis coincide with specific changes in the gut flora.