Dose Ranging Study Comparing the Efficacy, Safety and Pharmacokinetics of Intravenous Infusions of ABT-874 vs Placebo in Subjects With Active Crohn's Disease

Exclusion Criteria

• •Current diagnosis of the colitis other than Crohn's disease.
• •Symptomatic known strictures.
• •Surgical bowel resections within the past 6 months or is planning any resection at any time point while enrolled in the study.
• •Ostomy or ileoanal pouch. (Subjects with a previous ileo-rectal anastomosis are not excluded).
• •Short bowel syndrome as determined by the investigator.
• •Infection or risk factors for severe infections.
• •Females who are pregnant or considering becoming pregnant during the study, or breast-feeding.