- Known or suspected congenital or acquired immunodeficiency, resulting for example from: end-stage renal disease requiring dialysis; active neoplastic disease or active hematologic malignancy; receipt of immunosuppressive therapy or other immune-modifying drugs such as, but not limited to anti-cancer chemotherapy or radiation therapy within the preceding 6 months, or long-term systemic corticosteroid therapy (prednisone or equivalent for more than 2 consecutive weeks within the past 3 months)