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    Toxoplasmosis is an infection due to the parasite Toxoplasma gondii.

    This article discusses toxoplasmosis in adults or adolescents. For information on toxoplasmosis in babies, see: Congenital toxoplasmosis


    Toxoplasmosis is found in humans worldwide, and in many species of animals and birds. Cats are the definitive host of the parasite.

    Human infection may result from:

    • Blood transfusions or solid organ transplants
    • Carelessly handling cat litter, which can lead to accidental consumption of infectious particles
    • Eating contaminated soil
    • Eating raw or undercooked meat (lamb, pork, and beef)

    Toxoplasmosis also affects people who have weakened immune systems.

    The infection may also be passed from an infected mother to her baby through the placenta. See: Congenital toxoplasmosis


    Theremay be nosymptoms.Symptoms usually occur about 1 to 2 weeks after you come in contact with the parasite. The disease can affect the brain, lung, heart, eyes, or liver.

    Symptoms in persons with otherwise healthy immune systems:

    • Enlarged lymph nodes in the head and neck
    • Headache
    • Fever
    • Mild illnesssimilar to mononucleosis
    • Muscle pain
    • Sore throat

    Symptoms in people with a weakened immune system:

    • Confusion
    • Fever
    • Headache
    • Blurred vision due to inflammation of the retina
    • Seizures

    For information onbabies born with the condition, see: congenital toxoplasmosis

    Exams and Tests

    The doctor or nurse will perform a physical exam. Tests that may be done include:

    • Antibody titers for toxoplasmosis
    • Cranial CT scan
    • MRI of head
    • Slit lamp exam
    • Brain biopsy


    Those without symptoms typically do not need treatment.

    Medications to treat the infection include an antimalarial drug and antibiotics. AIDS patients should continue treatment for as long as their immune system is weak to prevent the disease from reactivating.

    For information regarding treatment of babies and pregnant women, see congenital toxoplasmosis.

    Outlook (Prognosis)

    With treatment, people with a healthy immune system usually recover well.

    Possible Complications

    The disease may return.

    In people with a weakened immune system, the infection may spread throughout the body. This can be deadly.

    When to Contact a Medical Professional

    Call for an appointment with your health care provider if you develop symptoms of toxoplasmosis. Immediate medical care is needed if symptoms occur in:

    • Infants or babies
    • Someone with a weakened immune system due to certain medications or disease

    Immediatemedical treatment is also needed if the following symptoms occur:

    • Confusion
    • Seizures


    Tips for preventing this condition:

    • Do not eat undercooked meat.
    • Wash hands after handling raw meat.
    • Keep children's play areas free from cat and dog feces.
    • Wash your hands thoroughly after touchingsoil that may be contaminated with animal feces.

    Pregnant women and those with weakened immune systems should take the following precautions:

    • Do notclean cat litter boxes
    • Do not touch anything that may containcat feces
    • Do not touch anything thatcould be contaminated by insects exposed to cat feces (cockroaches, flies, etc.)

    Pregnant women and those with HIV should be screened for toxoplasmosis. A blood test can be done.


    Montoya JG. Toxoplasmosis. In: Goldman L, Schafer AI, eds.Cecil Medicine. 24th ed.Philadelphia,PA: Saunders Elsevier; 2011:chap 357.


    • Slit-lamp exam


    • Congenital toxoplasmosis


    • Antibodies


      • Slit-lamp exam


      • Congenital toxoplasmosis


      • Antibodies


      A Closer Look

        Tests for Toxoplasmosis

          Review Date: 12/6/2011

          Reviewed By: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine; Jatin M. Vyas, MD, PhD, Assistant Professor in Medicine, Harvard Medical School, Assistant in Medicine, Division of Infectious Disease, Department of Medicine, Massachusetts General Hospital. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

          The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.

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