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 #Reactive #Atypical #Lymphocytosis #differential #diagnosis #hematology
