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Equine Severe Combined Immune Deficiency (view source)

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==Description==

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Severe combined immunodeficiency disease (SCID) of horses is an autosomal, recessive hereditary disease occurring in 2-3% of Arab or cross-bred Arab foals. About 16-25% of Arabian horses are carriers of the disease. SCID is characterised by a complete absence of functional B and T lymphocytes and affected (homozygous) foals fail to produce antigen-specific immune responses. The disease results in the absence of a functional immune system and affected foals are unable to resist or recover from infections.

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Severe combined immunodeficiency disease (SCID) of horses is an autosomal, recessive hereditary disease occurring in 2-3% of Arab or cross-bred Arab foals. About 16-25% of Arabian horses are carriers of the disease. SCID is characterised by a complete absence of functional B and T lymphocytes and affected (homozygous) foals fail to produce antigen-specific immune responses. The disease results in the absence of a functional immune system and affected foals are unable to resist or recover from infections. In

==Signalment==

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==Clinical signs==

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Affected foals are clinically normal at birth and usually develop infections at around two to three months of age due to declining maternal antibodies in the colostrum. The most common clinical signs relate to infections of the respiratory tract such as nasal discharge, cough, dyspnoea or increased respiratory sounds. Other clinical signs include intermittent fever, pneumonia, weight loss and diarrhoea.

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==Diagnosis==

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The diagnosis of SCID is based on three criteria; a) persistent lymphopaenia with less than 1000 lymphocytes per ml, b) lack of serum IgM in foals over four weeks of age and c) lymphoid hypoplasia. Diagnosis is often difficult and post mortem examination may be required. Post mortem findings of a small thymus and/or absent lymph nodes combined with the presence of opportunistic infections support a diagnosis of SCID. Histologically, lymph node follicles and germinal centres are absent.

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==References==

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*McClure, J. T. (1997) '''New Developments in Severe Combined Immunodeficiency Disease''' ''Proceedings of the Annual Convention of the AAEP (43) pp61-64''

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Affected foals are clinically normal at birth and usually develop infections at around two to three months of age due to declining maternal antibodies in the colostrum. The most common clinical signs relate to infections of the respiratory tract such as nasal discharge, cough, dyspnoea or increased respiratory sounds.

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*Foals usually die from bronchopneumonia

[[Category:Primary Adaptive Immunity Deficiencies]]

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[[Category:Horse]]

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