This is a single center, open-label, Phase 1 bioequivalence (BE) study in healthy subjects designed to demonstrate the bioequivalence of a single dose of certolizumab pegol (CZP) 200mg when injected by means of a prefilled syringe (PFS, reference) or injected by means of a injection device (e-Device, test).

Inclusion Criteria:

• Subject is male or female and between 18 and 55 years of age at Screening.
• Subject is in good physical and mental health status determined on the basis of the medical history and a general clinical examination.
• Subject has no evidence of active or inactive Tuberculosis (TB).
• Female subjects of childbearing potential should have a negative pregnancy test at study entry and should be using a medically accepted method of contraception during the entire duration of the study and for 10 weeks after the final dose of CZP.

Female subjects who are postmenopausal for at least 2 years and have a serum follicle stimulating hormone (FSH) level >40mIU/mL at the Screening Visit, or have undergone a hysterectomy, bilateral tubal ligation, and/or bilateral ovariectomy, or have a congenital sterility are considered not of childbearing potential.

Exclusion Criteria:

• Subject receiving any live (includes attenuated) vaccination or immunoglobulins within 56 days preceding the CZP injection.
• Subject has taken any drugs (including over-the-counter medications) within 56 days preceding the CZP injection (with the exception of those noted in Section 7.8.1.).
• Subject is known to be intolerant to pegol.
• Subject has previously received CZP.
• Subject has received TNFα-inhibitors within 12 months or other biologic within 6 months before randomization into the study.
• Subject has an active or chronic/latent infection including TB, hepatitis C virus (HCV), hepatitis B core antigen (HBc), or human immunodeficiency virus (HIV).-- Subject has symptomatic herpes zoster infection (shingles) within 6 months prior to Screening.
• Subject has chronic, serious, opportunistic recurring infection or condition within 6 months prior to Screening.