- Impaired immune function or chronic infections including (but not limited to) HIV, hepatitis B or C; organ transplant; active cancer or any history of hematologic cancer; receipt of chemotherapy, radiation therapy (past 36 months) or any other potentially immunosuppressive therapy [i.e. Systemic steroids at any dose and intra-articular administration of steroids in the past 3 months; (Nasal and topical steroids are allowed)], congenital immunodeficiency, anatomical or functional asplenia;