Reactive or "Atypical" Lymphocytosis

Infection

 • Viral: EBV, CMV, HIV, Herpes viruses, Influenza, Varicella, HTLV-I

 • Bacterial: Pertussis

 • Parasitic: Toxoplasmosis, Babesia

Autoimmune

 • Rheumatoid arthritis

Hypersensitivity

 • Drug induced

 • Serum sickness

Other

 • Hyperthyroidism

 • Trauma

 • Post splenectomy

 • Cigarette smoking



BWH Medicine Chiefs @BrighamChiefs



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