RESUMEN
Background: To date, Chronic Lymphocytic Leukemia (CLL) has been viewed as a malignant disease with tumor growth of cells. This hypothesis should be reviewed. Methods: A patient diagnosed with CLL is treated with Amanita phalloides, containing amanitin, inhibiting specifically tumor cell activity without affecting normal cells. Despite initial leukocyte cell count decrease, further therapy fails after eight months. He suffers from severe symptoms of inflammation, not specific for CLL. Additional Borrelia infection is diagnosed and Terebinthina laricina is applied. Results: Herxheimer reaction occurs some weeks later, accompanied by continuous leukocyte cell count drop to normal range within four months, even after stopping Amanita therapy. All symptoms of borreliosis and CLL vanished. Conclusion: CLL might be induced by a Borrelia-infection. This should be considered in diagnostic and therapeutic regimen.