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Agammaglobulinemia in a horse
Journal of the American Veterinary Medical Association
|September 1, 1979
Summary
A young horse with persistent infections was diagnosed with agammaglobulinemia, a severe immunodeficiency. This condition prevented the horse from producing antibodies, highlighting a critical gap in its immune system.
Area of Science:
- Veterinary Immunology
- Equine Medicine
- Immunodeficiency Disorders
Background:
- Persistent fever, multifocal bacterial infections, and neutropenia in an 18-month-old Standardbred horse suggested an underlying immunologic deficiency.
- Initial clinical signs included recurrent infections and an abnormal white blood cell count with immature neutrophils.
Observation:
- Serum protein electrophoresis showed a severely depressed gamma-globulin fraction (0.2 g/100 ml).
- Immunologic testing and lymphoid tissue histology confirmed agammaglobulinemia, characterized by extremely low or undetectable levels of IgG, IgG(T), IgM, and IgA.
- The horse exhibited an inability to mount an antibody response to foreign antigens.
Findings:
- Cell-mediated immunity was intact, indicated by a positive skin reaction to phytohemagglutinin.
- Lymphocytes demonstrated normal in vitro responses to mitogenic stimulation.
- Histological examination of lymphoid tissues revealed a lack of germinal centers and plasma cells, consistent with a B-cell defect.
Implications:
- This case highlights agammaglobulinemia as a cause of severe combined immunodeficiency in horses.
- Understanding this condition is crucial for accurate diagnosis and management of recurrent infections in equine patients.
- The findings underscore the importance of immunoglobulin levels in diagnosing and characterizing B-cell deficiencies in veterinary medicine.