This is a long-term, randomized, multi-center, open-label study of infliximab treatment in adults with moderate to severe plaque-type psoriasis. This study is the long-term extension of Study P04271 (NCT00251641); Study P04271 is a Phase 3b, randomized, parallel-group, multicenter, open-label, 26-week study comparing the efficacy and safety of infliximab versus methotrexate in the treatment of adult subjects with moderate to severe plaque-type psoriasis. The objectives of this study are to assess the efficacy and safety of long-term maintenance therapy versus intermittent therapy with 5 mg/kg infliximab in a moderate to severe plaque-type psoriasis population.||During an interim safety evaluation of the trial, a higher incidence of serious and severe infusion reactions was observed in the intermittent treatment arm, consisting of a re-induction cycle (maximum of 4 infusions at 0, 2, 6 and 14 weeks) after a period of no treatment compared with the maintenance arm (infusions every 8 weeks without an interruption of treatment). Consequently, the sponsor has terminated the trial. The label will be updated to reflect this new information relating to the use of a re-induction regimen with infliximab.