- Treatment with any of the following agents within 28 days of Screening: radiation therapy; cytotoxic chemotherapeutic agents; tuberculosis (TB) therapy, with the exception of treatment of latent TB with isoniazid; Immunomodulators that alter immune responses (such as systemic corticosteroids, interleukins, or interferons). Note: Participants using short-term (e.g. =<14 day) systemic corticosteroid treatment, topical, inhaled or intranasal corticosteroids are eligible for enrollment.