Immunodeficiency states and associated rheumatic manifestations.

For immunodeficiency states, the past year has been marked with the discovery of a series of events at the gene level and cell-to-cell interaction, particularly in common variable immunodeficiency, severe combined immunodeficiency, IgA deficiency, and immunodeficiency associated with IgM hyperimmunoglobulinemia. Clinical expression, especially in the musculoskeletal system, as well as infectious complications and therapy, also have been reported.