a disorder of the immune system

the ability to develop an immune response following exposure to an antigen

incapable of developing an immune response following exposure to an antigen

a serious (often fatal) disease of the immune system transmitted through blood products especially by sexual contact or contaminated needles

a rare immunological disorder characterized by the virtual absence of gamma globulin in the blood and consequent susceptibility to infection

an abnormally low concentration of gamma globulin in the blood and increased risk of infection

a congenital disease affecting T cells that can result from a mutation in any one of several different genes; children with it are susceptible to infectious disease; if untreated it is lethal within the first year or two of life