Active or draining fistula present at screening

Lactating and/or pregnant female subjects

A history of any health condition that could potentially interfere with the disease and/or the treatment

A history of an adverse reaction to polyethylene glycol (PEG) or a protein medicinal product

Any other condition which in the Investigator's judgment would make the patient unsuitable for inclusion in the study

History of drug or alcohol abuse in the prior year

Receipt of any experimental therapy within or outside a clinical trial in the 3 months prior to Visit 0

Corticosteroid Sparing Effect of Certolizumab in Crohn's Disease