A Study on the Safety of TAK-279 and Whether it Can Reduce Inflammation in the Bowel of Participants With Moderately to Severely Active Crohn's Disease

The drug being tested in this study is TAK-279. TAK-279 is being tested to treat participants with moderately to severely active Crohn's disease. The study will look at the efficacy and safety of TAK-279. The study will enroll approximately 268 participants. During the Induction Period participants will be randomly assigned to one of the following treatment groups in a ratio of 1:1:1:1 to receive TAK-279 or placebo which will remain undisclosed to the participant and study doctor during the study (unless there is an urgent medical need): 1. TAK-279 Dose 1 2. TAK-279 Dose 2 3. TAK-279 Dose 3 4. Placebo This multi-center trial will be conducted globally. The overall study duration is approximately 60 weeks including a 4-week safety follow-up period.