6. Any current or expected receipt of immunosuppressive agents including steroids (≥ 2 mg/kg per day of prednisone or its equivalent, or ≥ 20 mg/day if the participant weighs >10 kg, given daily or on alternate days for ≥ 14 days); children in this category should not receive investigational product until immunosuppressive agents including corticosteroid therapy have been discontinued for ≥ 30 days; the use of topical steroids is permitted according to the judgment of the investigator