The purpose of this program is to provide early access to ustekinumab where it is commercially unavailable for the treatment of participants with moderately to severely active Crohn's disease who have failed treatment with conventional Crohn's disease therapy (example, immunomodulators or corticosteroids) and Tumor Necrosis Factor alpha (TNF alpha) antagonist therapy (e.g., infliximab, adalimumab, certolizumab pegol, or their biosimilars), or who are intolerant to, or have a contraindication to these treatments. During the course of this early access program (EAP), through the reporting of serious adverse events (SAEs) and non-serious adverse drug reactions (ADRs) by participating physicians, information on the safety and tolerability of ustekinumab will be captured.

Inclusion Criteria:

• Have Crohn's disease or fistulizing Crohn's disease of at least three months' duration at the time of screening, with colitis, ileitis, or ileocolitis, confirmed at any time in the past by radiography, histology, and/or endoscopy

• Have active Crohn's disease, defined as:

  1. Baseline Crohn's disease activity index (CDAI) score of >= 220, and
  2. At least one of the following: a.) Abnormal C-reactive protein (CRP) levels at screening (defined by the participating physician/institution), b.) Fecal calprotectin level greater than or equal to (>=) 250 milligram per kilogram (mg/kg) at screening, c.) Endoscopy with evidence of active Crohn's disease during the current disease flare (defined as ulcerations in the ileum and/or colon). The endoscopy must have occurred within six months prior to baseline, d.) Harvey Bradshaw index (HBI) >= 5

• Otherwise healthy on the basis of physical examination, medical history, vital signs, and 12-lead electrocardiogram (ECG) performed at screening. If there are abnormalities, they must be consistent with the underlying illness in the program population. This determination must be recorded in the participant's source documents and initialed by the physician

• Have failed treatment with conventional therapy (example, immunomodulators or corticosteroids) and Tumor necrosis factor alpha (TNFalpha) antagonist therapy (example, infliximab, adalimumab, certolizumab pegol, or their biosimilars), or are intolerant to, or have a contraindication to these treatments. The failure of conventional or biological therapy is defined as being a participant who, in the opinion of the health care provider, have not responded adequately to the treatment (that is, primary non-responders), or who lost response or became intolerant over time to the treatment (that is, secondary non-responders) based on the physician's judgement. The failure of conventional or TNF alpha antagonist therapy is defined as being a participant who, in the opinion of the health care provider, did not respond adequately to the treatment (that is, primary non-responders), or who lost response or became intolerant over time to the treatment (that is, secondary non-responders) based on the physician's judgement

• Meet one of the following conditions: a). Participant is female: Not of childbearing potential or of childbearing potential and has a confirmed negative pregnancy test and will be sexually inactive or agrees to practice a highly effective method of birth control, including hormonal prescription oral contraceptives, contraceptive injections, contraceptive patches, intrauterine devices, double-barrier method (example, condoms, diaphragms, or cervical caps, with spermicidal foam, cream, or gel) during and after participation in the early access program (EAP). Male condom and female condom should not be used together (due to risk of failure with friction). These restrictions apply through 20 weeks after receiving the last dose of ustekinumab, b). Participant is male: either sexually inactive or agrees to practice a highly effective method of birth control, such as a condom with spermicide during and after participation in the EAP, and agrees not to donate sperm during and after ustekinumab treatment. These restrictions apply through 20 weeks after receiving the last dose of ustekinumab

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, and would possibly confound the ability to assess the safety of treatment with ustekinumab
• Has had any kind of bowel resection within six months or any other intra-abdominal surgery within three months prior to baseline
• Has evidence of current active infection, including untreated latent tuberculosis, or a nodule suspicious for lung malignancy on screening or any other available chest radiograph, unless definitively resolved surgically or by additional imaging and with source document confirmation
• Has or is suspected to have an undrained abscess
• Enrolled in a clinical program of ustekinumab treatment of Crohn's disease in Brazil