title: Agammaglobulinemia in a horse.
abstract: Immunologic deficiency was suspected in an 18-month-old Standardbred horse with persistent fever, multifocal bacterial infection, and neutropenia with a large number of immature neutrophils. Serum protein electrophoresis revealed marked depression of the gamma-globulin fraction (0.2 g/100 ml). Immunologic testing and histologic examination of lymphoid tissues identified the immune deficit as agammaglobulinemia. Serum concentrations of immunoglobulin (Ig)G and IgG(T) were initially low and declined with time; IgM and IgA were not detectable. The horse failed to produce antibodies when inoculated with foreign antigens but had a positive cell-mediated skin reaction to intradermal phytolectin injection, and lymphocytes responded normally to in vitro stimulation by mitogens. Histologic examination of lymphoid tissues revealed absence of germinal centers and plasma cells.
mesh_terms: D000361:Agammaglobulinemia / Q000175:diagnosis / Q000473:pathology / Q000662:veterinary*; D000818:Animals; D006734:Horse Diseases / Q000175:diagnosis* / Q000473:pathology; D006736:Horses; D007070:Immunoglobulin A / Q000032:analysis; D007074:Immunoglobulin G / Q000032:analysis; D007075:Immunoglobulin M / Q000032:analysis; D008198:Lymph Nodes / Q000473:pathology; D008297:Male; D013154:Spleen / Q000473:pathology
chemical_list: D007070:Immunoglobulin A; D007074:Immunoglobulin G; D007075:Immunoglobulin M