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Central nervous system
Central nervous system


Definition:

Aseptic meningitis is an illness that appears similar to bacterial meningitis; however, bacteria do not grow in cultures of the fluid around the brain and spinal cord (cerebrospinal fluid).

See also:



Alternative Names:

Sterile meningitis



Causes, incidence, and risk factors:

There are many causes of aseptic meningitis, including:

  • Infections near the brain or spinal cord, such as epidural abscesses
  • Fungi
  • Mycobacteria
  • Some cancers (cause a syndrome similar to meningitis)
  • Some medications (such as antibiotics and over-the-counter anti-inflammatory medications)
  • Tick-borne diseases (such as Lyme disease )
  • Tuberculosis
  • Viruses

About half of aseptic meningitis cases are caused by the coxsackie virus and echovirus, two members the enterovirus family. The rate of enteroviral infections increases in the summer and early fall. Enteroviruses are spread by hand-to-mouth contact and coughing. They also may be spread by contact with fecal matter.

Other viruses that cause this condition include:

Risk factors for aseptic meningitis include:

  • Being a health care worker
  • Having a suppressed immune system
  • Exposure to children in a day care setting
  • Exposure to someone with a recent viral infection


Symptoms:

Signs and tests:

For any patient with meningitis, it is important to perform a lumbar puncture ("spinal tap "), in which a sample of spinal fluid (known as cerebrospinal fluid, or CSF) is taken for testing.

Tests may include:

  • Bacterial cultures of spinal fluid
  • Other cultures or special tests of spinal fluid
  • White blood cell count
  • White blood cell count in spinal fluid


Treatment:

Treatment is needed for fungal or mycobacterial causes of aseptic meningitis. Herpesvirus or varicella (chicken pox) virus may be treated with antiviral medicines. Treatment for non-infectious causes consists of pain medications and management of complications, if they occur.

No specific treatment is available for enteroviral aseptic meningitis.



Support Groups:



Expectations (prognosis):

Aseptic meningitis caused by a virus is usually a harmless disease. People usually recover fully 5 - 14 days after symptoms start.

Fatigue and light-headedness may last longer in some people.



Complications:

An infection of the brain (encephalitis ) may develop, though this is rare. The infection may last much longer in a person with a depressed immune system.



Calling your health care provider:

Call your health care provider if you have symptoms of aseptic meningitis.



Prevention:

To reduce the risk of developing an infection that can become meningitis:

  • Get vaccinated (against mumps or chickenpox, for example)
  • Practice good hand washing
  • Practice other general good health measures


References:

Swartz MN. Meningitis: bacterial, viral, and other. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsever; 2007: chap 437.




Review Date: 9/28/2008
Reviewed By: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine; and Jatin M. Vyas, MD, PhD, Instructor in Medicine, Harvard Medical School, Assistant in Medicine, Division of Infectious Disease, 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. Call 911 for all medical emergencies. 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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