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Medical Definition of X-linked hypogammaglobulinaemia
1. A congenital, X-linked recessive, primary immunodeficiency characterised by decreased numbers (or absence) of circulating B-lymphocytes with corresponding decrease in immunoglobulins of the five classes; associated with marked susceptibility to infection by pyogenic bacteria (notably, pneumococci and Haemophilus influenzae) beginning after loss of maternal antibodies. X-linked hypogammaglobulinaemia with growth hormone deficiency, hypogammaglobulinaemia combined with a reduced number of B-cells; characterised by short stature, delayed puberty, and recurrent infections. (05 Mar 2000)