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==Description==
Lymphocytosis refers to an increase in the number of circulating lymphocytes in the blood. The major causes of lymphocytosis are:
*** Some of the lymphocytes are immature - lymphoblasts.
*Neoplasia
*** For example, Bovine Leukosis.
**Several types of tumour may result in increases in the number of blood lymphocytes, including:
***Stage V [[Lymphoma|lymphoma]]
***Acute lymphoblastic and chronic lymphocytic leukaemia
***Bovine Leukosis caused by bovine leukaemia virus
*Stress
** Following adrenaline release in fear, excitement and so on.
** Following adrenaline release in fear, excitement and so on.
*Chronic infection
** In some cases of chronic infection.
** In some cases of chronic infection.
*** However, reactive hyperplasia in associated lymph nodes may not correlate with the numbers of circulating lymphocytes.
*** However, reactive hyperplasia in associated lymph nodes may not correlate with the numbers of circulating lymphocytes.
*Physiological
** Commonly in growing swine.
** Commonly in growing swine.
*** Possibly associated with aMycoplasma infection.
*Equine neonates
[[Category:Blood Cell Changes]][[Category:To Do - James]]
[[Category:Blood Cell Changes]][[Category:To Do - James]]