Lymphocytosis

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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:

  • Neoplasia
    • Several types of tumour may result in increases in the number of blood lymphocytes, including:
      • Stage V lymphoma
      • Acute lymphoblastic and chronic lymphocytic leukaemia
      • Bovine Leukosis caused by bovine leukaemia virus
  • Stress
    • Following adrenaline release in fear, excitement and so on.
  • Chronic infection
    • In some cases of chronic infection.
      • However, reactive hyperplasia in associated lymph nodes may not correlate with the numbers of circulating lymphocytes.
  • Physiological
    • Commonly in growing swine.
      • Possibly associated with aMycoplasma infection.
  • Equine neonates