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Meningitis and Encephalitis

Definition

Meningitis is an infection of the meninges, the membranes that surround the brain and spinal cord. Encephalitis is inflammation of the brain itself. Anyone can get encephalitis or meningitis. Causes of encephalitis and meningitis include viruses, bacteria, fungus, and parasites. Anyone experiencing symptoms of meningitis or encephalitis should see a doctor immediately.

Symptoms of encephalitis that might require emergency treatment include loss of consciousness, seizures, muscle weakness, or sudden severe dementia. Other symptoms include:

  • sudden fever,
  • headache,
  • vomiting,
  • heightened sensitivity to light,
  • stiff neck and back,
  • confusion and impaired judgment,
  • drowsiness,
  • weak muscles,
  • a clumsy and unsteady gait,
  • irritability.
  • In more severe cases, people may have problems with speech or hearing, vision problems, and hallucinations.

Symptoms of meningitis, which may appear suddenly, often include:

  • high fever,
  • severe and persistent headache,
  • stiff neck,
  • nausea,
  • sensitivity to bright light,
  • vomiting, and
  • changes in behavior such as confusion, sleepiness, and difficulty waking up.

In infants, symptoms of meningitis or encephalitis may include fever, vomiting, lethargy, body stiffness, unexplained irritability, and a full or bulging fontanel (the soft spot on the top of the head).

Prognosis

The prognosis for people with encephalitis or meningitis varies. In most cases, people with very mild encephalitis or meningitis can make a full recovery, although the process may be slow. Individuals who experience mild symptoms may recover in 2-4 weeks. Other cases are severe, and permanent impairment or death is possible. The acute phase of encephalitis may last for 1 to 2 weeks, with gradual or sudden resolution of fever and neurological symptoms. Individuals treated for bacterial meningitis typically show some relief within 48-72 hours. Neurological symptoms may require many months before full recovery. With early diagnosis and prompt treatment, most individuals recover from meningitis. However, in some cases, the disease progresses so rapidly that death occurs during the first 48 hours, despite early treatment.

Treatment

Anyone experiencing symptoms of meningitis or encephalitis should see a doctor immediately. Antibiotics for most types of meningitis can greatly reduce the risk of dying from the disease. Antiviral medications may be prescribed for viral encephalitis or other severe viral infections. Anticonvulsants are used to prevent or treat seizures.

Corticosteroid drugs can reduce brain swelling and inflammation. Over-the-counter medications may be used for fever and headache. Individuals with encephalitis or bacterial meningitis are usually hospitalized for treatment. Affected individuals with breathing difficulties may require artificial respiration.

Source: https://www.ninds.nih.gov/

March 28, 2019
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