Changes

==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.  Its causes therefore 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.  Its causes therefore include:

 

*Viral infection with [[Paramyxoviridae#Canine Distemper Virus (CDV)|canine distemper]], [[Infectious canine hepatitis]], [[Feline infectious enteritis]] or [[Bovine Viral Diarrhoea]] (BVD)

*Viral infection

**[[Paramyxoviridae#Canine Distemper Virus (CDV)|Canine Distemper]]

**Infectious Canine Hepatitis

**Feline Infectious Enteritis

**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 '''SCID''' (Severe Combined Immunodeficiency Syndrome) in Arab foals and [[Feline Immunodeficiency Virus|'''FIV''']] infection.

*Inherited or acquired immunodeficiency syndromes, including '''SCID''' (Severe Combined Immunodeficiency Syndrome) in Arab foals and [[Feline Immunodeficiency Virus|'''FIV''']] infection.