<unk>  is a form of<unk>  appearing after birth, leading to a reduction in the level of IgG, and also sometimes IgA and IgM. (The ratios of immunoglobulins vary rapidly in all infants, and the term dysgammaglobulinemia, although theoretically applicable, is not usually used in<unk> s context.) It can result in increased infections, but it can also present without symptoms.
Transient hypogammaglobulinemia of infancy
Selective immunoglobulin A deficiency
Adult-onset immunodeficiency syndrome
X-linked agammaglobulinemia
Primary immunodeficiency
Isolated primary immunoglobulin M deficiency
Combined immunodeficiencies
Severe combined immunodeficiency