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Background Strategies that target the microbiome may offer an alternative therapeutic approach for Ulcerative Colitis (UC). The goal of the pilot trial was to evaluate the efficacy of a novel microbe-directed UC diet (UCD) for clinical remission, as well as use of antibiotics for dietary refractory patients as an alternative strategy for remission. Methods This was a prospective, single arm, open label, pilot study in patients aged 8–19, with a pediatric UC activity index (PUCAI) scores &amp;gt;10 on stable maintenance therapy. Patients failing to enter remission (PUCAI&amp;lt;10) on diet could receive a 14-day course of Amoxycillin, Metronidazole and Doxycycline (AMD), and were re-assessed on day 21. The primary endpoint was intention to treat (ITT) remission at week 6 with UCD. Results Twenty-four UCD treatment courses were given to 23 eligible children (mean age 15.3±2.9 years). Median PUCAI decreased from baseline 35 (30–40) to 12.5 (5–27.5) week 6 (P=0.001). Clinical remission with UCD alone was achieved in 9/24 (37.5%). Median calprotectin declined from baseline 818 (630.0–1880.0) to 592.0 (140.7–902.4) week 6. Eight patients received treatment with antibiotics after failing diet, 4/8 (50.0%) subsequently entered remission 3 weeks later. Conclusion The UC Diet appears to be effective for induction of remission in children with mild to moderate UC suggesting that diet could play a role in the disease. Sequential use of UCD followed by antibiotic therapy needs to be evaluated as a microbiome targeted steroid sparing strategy.

P492 The UC Diet and Antibiotics for Treatment of Mild to Moderate Pediatric Ulcerative Colitis: A prospective open label pilot study