Lymphocytosis

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