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Lymphocytosis is an increase in the number or proportion of lymphocytes in the blood cells i.e. Lymphocyte count is more than 5000/ml. Causes of Lymphocytosis include viral infection, Lymphoproliferative disorder, Toxoplasmosis, etc. Lymphocytosisis commonly short lived.
Autoimmune disorders are another potential cause of lymphocytosis. Lymphocytosis is a relatively common finding in younger patients it is usually transient and reactive and in older patients a persistent lymphocytosis may be due to an underlying lymphoid disorder such as CLL or lymphoma where as in normal people blood lymphocytes are made of T cells (80%) and B cells (20%). Non-malignant transient causes include viral infections such as infectious mononucleosis, CMV, HIV and hepatitis; chronic infection with brucellosis, tuberculosis and syphilis, splenectomy have a persistent lymphocytosis, chronic lymphoproliferative disorders will cause a persistent of more than 3 months.
Related Journals of Lymphocytosis