Loisieux

Researchers are evaluating VE303, a live biotherapeutic product made of eight nonpathogenic bacterial strains, to prevent recurrent Clostridioides difficile infection (CDI). This randomized, double-blind, placebo-controlled Phase 3 trial aims to assess the safety and CDI recurrence rate at 8 weeks in participants receiving a 14-day course of VE303 or a matching placebo. The study includes two stages: one focusing on participants with recurrent CDI and the other on those with primary CDI at high risk of recurrence. Participants will receive either VE303 or placebo capsules that look identical and contain no active drug. The treatment lasts for 14 days, starting on the last planned day of standard antibiotic therapy for the qualifying CDI episode or within 2 days after completing antibiotics. Participants must have completed and responded to standard antibiotic treatment before receiving study medication. The study evaluates the effect of VE303 versus placebo on preventing CDI recurrence after antibiotic therapy. During the study, participants will be monitored through clinical evaluations to track CDI recurrence by Week 8, including stool samples tested for CDI. Safety and clinical response will be assessed throughout the study period. Participants are followed to ensure stability after the qualifying CDI episode and to monitor any complications or adverse events. The total participation duration includes treatment and follow-up through Week 8 to measure CDI recurrence rates and safety.