- Any confirmed or suspected immunosuppressive or immunodeficient condition based on medical history (e.g. HIV infection, genetic defect, immunosuppressive therapy). *Chronic administration (defined as more than 14 days) of immune-modifying drugs within 6 months prior to the first vaccine dose or planned use during the study period is exclusionary (corticosteroid use - immune-modifying level is ≥0.5 mg/kg/day; inhaled or topical steroids are acceptable).