This protocol is designed for the screening and baseline assessment of and collection of research sample from patients with abnormalities of immune function as manifested by recurrent or unusual infections, recurrent or chronic inflammation, or previous laboratory evidence of immune dysfunction. Abnormalities of immune function may be inherited or may be iatrogenic such as that following hematopoietic stem cell transplantation or other treatments resulting in prolonged immune dysfunction. Blood and/or bone marrow cells may also be used to investigate the utility of induced pluripotent stem cells (iPS) for immune cell derivation and targeted gene correction. This is not a protocol to study or screen for human immunodeficiency virus infection, though patients with HIV infection who may have other causes for immune dysfunction are not excluded. First or second degree genetically related family members (limited to mother, father, siblings, grandparents, children, aunts, uncles and first cousins of an affected patient) may also be screened for clinical, in vitro and genetic correlates of immune abnormalities. Healthy Volunteers will be enrolled as a source of control blood samples for research testing, not to include genetic testing. Screening and baseline assessment under the auspices of this study may be limited to two visits over one year period, unless the patient has been determined by initial evaluation to require further study at NIH or are ongoing long-term safety assessments as required by their participation on a gene therapy or transplant protocol. Patients with documented immune dysfunction may receive limited medically indicated treatment if that medically indicated treatment is related to the abnormality of immune function under study, with such treatment limited to the period of the one year baseline assessment indicated in this protocol. When screening and assessment is complete, patients will be offered an opportunity to participate in another study, or if there are no active studies appropriate for the patient, other options will be suggested to the primary or referring physician.