What are etiologies of immunodeficiency?

IgG def (congenital agammaglobinemia, selective def, acquired def, hypogammaglob (Nezlof / Bare lymphocyte syndrome) IgA (selective def, Ataxia-Telangiectasia syndrome) Leukocyte dysfunction (Chronic granulomatous disease -NADPH oxidase dysfunction) Other rare ones (WHIM, hypergammaglobinemia)