Study of Two Dosing Schedules of Adalimumab in Subjects With Moderate to Severe Chronic Plaque Psoriasis

Inclusion Criteria: * Diagnosis of moderate to severe chronic plaque psoriasis * Active psoriasis, despite topical therapies Exclusion Criteria: * Other active skin diseases or skin infections * Prior exposure to any anti-TNF therapy * Subject has other active skin diseases * Multiple concomitant therapy restrictions and/or washouts (topicals, UV, other systemic PS therapies) * Poorly controlled medical conditions * History of neurologic symptoms suggestive of central nervous system (CNS) demyelinating disease * History of cancer or lymphoproliferative disease * History of active TB or listeriosis, or persistent chronic or active infections * Known to have immune deficiency or is immunocompromised * Clinically significant abnormal laboratory test results * Erythrodermic psoriasis or generalized pustular psoriasis