- Known or suspected immune dysfunction that is caused by a medical condition or any other cause. Examples of medical conditions associated with immune dysfunction include congenital immunodeficiency, human immunodeficiency virus (HIV) infection, organ or bone marrow transplantation, leukemia, lymphoma, Hodgkin's disease, multiple myeloma, or generalized malignancy. Subjects with a history of cancer who are not on active treatment and are not thought to have a weakened immune system at the time of enrollment will be eligible