Lymphocytosis

• Lymphocytosis is an increase in numbers of lymphocytes in the blood.

• Occurs:
  • In tumours in which there is a substantial increase in their number.
    • Some of the lymphocytes are immature - lymphoblasts.
    • For example, Bovine Leukosis.
  • Following adrenaline release in fear, excitement and so on.
  • In some cases of chronic infection.
    • However, reactive hyperplasia in associated lymph nodes may not correlate with the numbers of circulating lymphocytes.
  • Commonly in growing swine.

• • • Possibly associated with aMycoplasma infection.