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    Hantavirus

    Hantavirus pulmonary syndrome; Hemorrhagic fever with renal syndrome

    Hantavirus is a life-threatening disease spread to humans by rodents that has symptoms similar to influenza.

    Causes

    Hantavirus is carried by rodents, especially deer mice. The virus is found in their urine and feces, but it does not make the animal sick.

    It is believed that humans can get sick with this virus if they come in contact with contaminated dust from mice nests or droppings. You may come in contact with such dust when cleaning homes, sheds, or other enclosed areas that have been empty for a long time.

    Hantavirus does not spread between humans.

    Rodents carrying the hantavirus have been found in many U.S. national parks. Campers and hikers may be more likely to catch the disease than most people. This is because they pitch tents on the forest floor and lay their sleeping bags down in musty cabins.

    However, only a couple of cases have been directly linked to camping or hiking. Most people who are exposed to the virus have come in contact with rodent droppings in their own homes.

    Symptoms

    The early symptoms of hantavirus disease are similar to the flu and include:

    • Chills
    • Fever
    • Muscle aches

    People with hantavirus may begin to feel better for a very short amount of time, but within 1-2 days, it becomes hard to breathe. The disease gets worse quickly. Symptoms include:

    • Dry cough
    • General ill feeling (malaise)
    • Headache
    • Nausea and vomiting
    • Shortness of breath

    Exams and Tests

    The health care provider will perform a physical exam. This may reveal:

    • Acute respiratory distress syndrome (ARDS)
    • Kidney failure
    • Low blood pressure (hypotension)
    • Low blood oxygen levels, which cause the skin to turn a blue color

    The following tests may be done:

    • Blood tests to check for signs of hantavirus
    • Complete blood count (CBC)
    • Complete metabolic panel
    • Kidney and liver function tests
    • X-ray of the chest

    Treatment

    People with hantavirus are admitted to the hospital, often to the intensive care unit (ICU).

    Treatments will include:

    • Oxygen
    • Breathing tube or breathing machine in severe cases
    • A medication called ribavirin to treat kidney-related problems and reduce the risk of death

    There is no effective treatment for hantavirus infection involving the lungs.

    Outlook (Prognosis)

    Hantavirus is a serious infection that gets worse quickly. Lung failure can occur and may lead to death. Even with aggressive treatment, more than half of people who have this disease in their lungs die.

    Possible Complications

    Complications of hantavirus may include:

    • Kidney failure
    • Heart and lung failure

    These complications can lead to death.

    When to Contact a Medical Professional

    Call your health care provider if you develop flu-like symptoms after you come in contact with rodent droppings or rodent urine, or dust that is contaminated with these substances.

    Prevention

    Avoid exposure to rodent urine and droppings.

    • When hiking and camping, pitch tents in areas where there are no rodent droppings.
    • Avoid rodent dens.
    • Drink disinfected water.
    • Sleep on a ground cover and pad.
    • Keep your home clean. Clear out potential nesting sites and clean your kitchen.

    If you must work in an area where contact with rodent urine or feces is possible, follow these recommendations from the Centers for Disease Control and Prevention (CDC):

    1. When opening an unused cabin, shed, or other building, open all the doors and windows, leave the building, and allow the space to air out for 30 minutes.
    2. Return to the building and spray the surfaces, carpet, and other areas with a disinfectant. Leave the building for another 30 minutes.
    3. Spray mouse nests and droppings with a 10% solution of chlorine bleach or similar disinfectant. Allow it to sit for 30 minutes. Using rubber gloves, place the materials in plastic bags. Seal the bags and throw them in the trash or an incinerator. Dispose of gloves and cleaning materials in the same way.
    4. Wash all potentially contaminated hard surfaces with a bleach or disinfectant solution. Avoid vacuuming until the area has been thoroughly decontaminated. Then, vacuum the first few times with enough ventilation. Surgical masks may provide some protection.

    References

    Bell M. Viral hemorrhagic fevers. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier;2007:chap 404.

    Peters CJ. California encephalitis, hantavirus pulmonary syndrome, and bunyavirid hemorrhagic fevers. In: Mandell GL, Bennett JE, Dolin R, eds. Douglas and Bennett's Principles and Practice of Infectious Disease. 7th ed. Philadelphia, Pa: Saunders Elsevier; 2009:chap 166.

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      Review Date: 3/11/2011

      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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