Clinical Trial Finder

Inclusion Criteria:

• - Have Crohn's disease (CD) or fistulizing Crohn's disease of at least 3 months duration, with colitis, ileitis, or ileocolitis, confirmed in the past by radiography, histology, and/or endoscopy.

• - Have moderately to severely active CD, defined as a baseline Crohn's disease activity index (CDAI) score of greater than or equal to (>=) 220 and less than or equal to (<=) 450, and either: a.

Mean daily stool frequency (SF) count >3, based on the unweighted CDAI component of the number of liquid or very soft stools or b. Mean daily abdominal pain (AP) score >1, based on the unweighted CDAI component of AP.

• - Have endoscopic evidence of active ileocolonic CD as assessed by central endoscopy reading at the screening endoscopy, defined as a screening simple endoscopic score for crohn's disease (SES-CD) score >=6 (or >=4 for participants with isolated ileal disease), based on the presence of ulceration in at least 1 of the 5 ileocolonic segments, resulting in the following specified ulceration component scores: a.

a minimum score of 1 for the component of "size of ulcers"; and b. a minimum score of 1 for the component of "ulcerated surface"

• - A woman of childbearing potential must have a negative highly sensitive serum (beta-human chorionic gonadotropin [beta-hCG]) at screening and a negative urine pregnancy test at baseline.

• - Must sign an informed consent form (ICF) indicating that he or she understands the purpose of, and procedures required for, the study and is willing to participate in the study.

Exclusion Criteria:

• - Has complications of Crohn's disease such as symptomatic strictures or stenoses, short gut syndrome, or any other manifestation that might be anticipated to require surgery, could preclude the use of the CDAI to assess response to therapy, or would possibly confound the ability to assess the effect of treatment with ustekinumab.

• - Has previously demonstrated lack of initial response (that is, primary nonresponders), responded initially but then lost response with continued therapy (that is, secondary nonresponders) to Vedolizumab.

• - Has a history of, or ongoing, chronic or recurrent infectious disease, including but not limited to, chronic renal infection, chronic chest infection (example, bronchiectasis), recurrent urinary tract infection (example, recurrent pyelonephritis or chronic non-remitting cystitis), or open, draining, or infected skin wounds or ulcers.

• - History of lymphoproliferative disease, including lymphoma, or signs and symptoms suggestive of possible lymphoproliferative disease, such as lymphadenopathy or splenomegaly or monoclonal gammopathy of undetermined significance.

- Has a history of severe, progressive, or uncontrolled renal, genitourinary, hepatic, hematologic, endocrine, cardiac, vascular, pulmonary, rheumatologic, neurologic, psychiatric, or metabolic disturbances, or signs and symptoms thereof

Arms

Experimental: Ustekinumab

Participants will receive a single dose of ustekinumab intravenously (IV) (weight-based dose approximating 6 milligrams per kilogram [mg/kg]) at Week 0. Participants with body weight less than or equal to (<=) 55 kg will receive ustekinumab IV of 260 mg, greater than (>) 55 kg and <=85 kg will receive ustekinumab IV of 390 mg, and >85 kg will receive ustekinumab IV of 520 mg at Week 0 in induction phase followed by ustekinumab 90 mg subcutaneously (SC) in maintenance phase from Week 8 to Week 52. For participants who achieve clinical response with ustekinumab induction dosing at Week 8, will continue to receive 90 mg ustekinumab SC every 12 weeks with final dose at Week 44. If these participants meet the criteria for loss of response from Week 16 to Week 40, dose can be adjusted to 90 mg every 8 weeks (q8w). Participants who are non-responders to ustekinumab at Week 8, and achieve clinical response at Week 16, will continue to receive ustekinumab 90 mg SC q8w from Week 16 to Week 48.

Interventions

Drug: - Ustekinumab

Ustekinumab will be administered as an IV injection in induction phase and as a SC injection in maintenance phase.