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immunodeficiency
(im″u-no-dә-fish´әn-se)
a deficiency of immune response or a disorder in which the immune response is deficient; classified as antibody (B cell), cellular (T cell), or combined deficiency disorders. Antibody immunodeficiencies
are marked by hypo- or dysgammaglobulinemia, recurrent bacterial otitis media, and sinopulmonary infections. Cellular immunodeficiencies are characterized by recurrent
low-grade or opportunistic infections, by graft-versus-host disease or reaction after blood transfusions, and by severe disease after immunization with live vaccines.

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