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February 9, 2012
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Brain Infection

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Brain Infection Overview

Our brain, the spinal cord, and its surrounding structures could become infected by a large spectrum of germs (that is, microorganisms). Bacteria and viruses are the most common offenders. Parasites, fungi, and others can infect the central nervous system (CNS), although more rarely.

  • Location: The infecting germ causes an inflammation of the area invaded. Depending on the location of the infection, different names are given to the diseases.
    • Meningitis is the inflammation of the meninges, the surrounding three-layered membranes of the brain and spinal cord, and the fluid it is bathed in, called cerebrospinal fluid (CSF).
    • Encephalitis is an inflammation of the brain itself.
    • Myelitis actually means a spinal cord inflammation.
    • Abscess is an accumulation of infectious material and offending microorganisms within the CNS.
  • Type: Organisms may cause bacterial, viral, parasitic, fungal, or prion infections of the central nervous system.
    • Usually, viral meningitis causes milder symptoms, requires no specific treatment, and goes away completely without complications. Viral infections are two to three times more common.
    • Bacterial meningitis is a very serious disease and may result in a learning disability, speech defects, hearing loss, seizures, loss of extremity function or amputation, permanent brain damage, and even death. According to the World Health Organization (WHO) statistics, up to 15% of the survivors of bacterial meningitis remain with permanent complications and health issues, as described above.
  • In the U.S., the overall incidence of bacterial meningitis decreased significantly since 1998, mostly as a result of widespread vaccination, from about 25,000 cases yearly to about 4,100 cases. About two-thirds of all cases are in children. Bacterial meningitis usually occurs in isolated cases without epidemics. It is more common in males than females and is more likely in late winter and early spring.
  • Worldwide, bacterial meningitis is common. It continues to be a serious threat to global health. The most recent statistics published by the WHO in 2010 estimates up to 170,000 annual deaths from bacterial meningitis worldwide. It particularly affects the African continent, with regular epidemics in sub-Saharan and West Africa, known as "the meningitis belt."
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Brain Infection - Treatment

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Brain Infection

Fever in Adults Overview

A fever (also termed pyrexia) is a higher-than-normal body temperature. It is a symptom caused by a variety of illnesses.

Every one of us has experienced the wave of chills and exhaustion that a fever causes. Fever usually occurs in response to an infection or inflammation. However, many other causes are possible, including drugs, poisons, cancer, heat exposure, injuries or abnormalities to the brain, or disease of the endocrine (hormonal or glandular) system.

A fever rarely comes without other symptoms. It is often accompanied by specific complaints, which may help to identify the illness causing the fever. This can help the doctor determine which treatment is necessary.

  • Normal body temperature can vary depending on the individual, the time of day, and even the weather. For most people, a temperature of 98.6 F (37 C) is baseline.
  • Temperature is usually controlled by the part of the brain calle...

Read the Fever (in Adults) article »


Read What Your Physician is Reading on Medscape

Brain Abscess »

Intracranial abscesses are uncommon, serious, life-threatening infections.

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