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The Lymphatic and the Immune System Rickettsia: a small bacterium that lives in lice, fleas, ticks, and mites Rubella: also known as German measles or three-day measles, is a viral infection characterized by a lowgrade fever, swollen glands, inflamed eyes, and a fine, pink rash. Ruptured spleen: a medical emergency that occurs when the covering of the spleen in torn. Sarcoma: a malignant tumor that arises from the connective tissues, including hard, soft, and liquid connective tissues. Spirochetes: long, slender, spiral shaped bacteria that have flexible walls and are capable of movement. Splenomegaly: abnormal enlargement of the spleen. Splenorrhagia: bleeding from the spleen. Staphylococci: a group of about 30 species of bacteria that form irregular groups or clusters resembling grapes. Streptococci: bacteria that form a chain Surgical biopsy: the removal of a small piece of tissue for examination to confirm a diagnosis. Systemic reaction: also described as anaphylaxis, or as anaphylactic shock, severe response to an allergen. T cells: also known as T lymphocytes, get the T in their name from their origin in the thymus. Teletherapy: radiation therapy administered at a distance from the body. Tomotherapy: combination of tomography and radiation therapy to precisely target the tumor being treated. Toxoplasmosis: a parasite that most commonly transmitted from pets to humans by contact with contaminated animal feces. Ultrasound: often used as an initial follow-up test when an abnormality is found by mammography. Varicella (VSZ): also known as chickenpox...