Subjects with moderate-to-severe chronic psoriasis not responding to standard or biologic therapy will be eligible to enroll in this study. Subjects will receive infliximab infusions (5 mg/kg of body weight) at Weeks 0, 2, 6, and 14 followed by a 12-week follow-up period. The efficacy of infliximab will be evaluated by the Psoriasis Area and Severity Index (PASI).