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==Description==
==Description==
Lymphopenia is a reduction in the numbers of lymphocytes in the blood. This phenomenon is most commonly associated with stress (as part of the '''stress leucogram''') or with viral infection. Causes include:
Lymphopenia is a reduction in the numbers of lymphocytes in the blood. This phenomenon is most commonly associated with stress (as part of the '''stress leucogram''') or with viral infection. Causes include:
*Stress leucogram, characterised by '''[[Neutrophilia|neutrophilia]]''', '''[[Monocytosis|monocytosis]]''', '''[[Eosinopenia|eosinopenia]]''' and '''[[Lymphopenia|lymphopenia]]'''. A similar pattern may occur with hyperadrenocorticism (Cushing’s disease) or exogenous corticosteroid therapy as these hormones selectively suppress lymphocytic activity and the inflammatory response in general.
*Viral infection with [[Canine Distemper Virus|canine distemper]], [[Infectious canine hepatitis]], [[Feline infectious enteritis|feline infectious enteritis]] or [[Bovine Viral Diarrhoea|bovine viral diarrhoea]] (BVD)
*Viral infection with [[Canine Distemper Virus|canine distemper]], [[Infectious canine hepatitis]], [[Feline infectious enteritis|feline infectious enteritis]] or [[Bovine Viral Diarrhoea|bovine viral diarrhoea]] (BVD)
*Bone marrow suppression caused by '''chemotherapy''' or '''radiotherapy'''. Since neutrophils have a much shorter circulating half life, they are the first cell line to fall with any insult to the bone marrow but lymphopenia may occur as part of a more severe pancytopenia.
*Bone marrow suppression caused by '''chemotherapy''' or '''radiotherapy'''. Since neutrophils have a much shorter circulating half life, they are the first cell line to fall with any insult to the bone marrow but lymphopenia may occur as part of a more severe pancytopenia.
*Inherited or acquired immunodeficiency syndromes, including '''[[Equine Severe Combined Immune Deficiency|SCID]]''' (Severe Combined Immunodeficiency Syndrome) in Arab foals and [[Feline Immunodeficiency Virus|'''feline immunodeficiency virus''']] infection.
*Inherited or acquired immunodeficiency syndromes, including '''[[Equine Severe Combined Immune Deficiency|SCID]]''' (Severe Combined Immunodeficiency Syndrome) in Arab foals and [[Feline Immunodeficiency Virus|'''feline immunodeficiency virus''']] infection.
*Leakage of lymphatic fluid may result in loss of lymphocytes, as occurs with '''[[Lymphangiectasia|lymphangiectasia]]''' or '''[[Chylous Effusion|chylothorax]]'''.
*Leakage of lymphatic fluid may result in loss of lymphocytes, as occurs with '''[[Lymphangiectasia|lymphangiectasia]]''' or '''[[Chylous Effusion|chylothorax]]'''.