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Meningitis is inflammation (infection) of the meninges which is the membrane that covers the brain.Most cases of meningitis are caused by microorganisms (such as viruses, bacteria, fungi, or parasites) that spread into the blood and into the cerebrospinal fluid (CSF). Non-infectious causes include cancers and certain drugs. Although the most common cause of meningitis is viral, bacterial meningitis (the second most frequent cause) can be very serious and life-threatening. Anyone suspected of having meningitis should have prompt medical evaluation. Meningitis can affect anyone in any age group, from the newborn to the elderly.
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The Mayo clinic site gives a good summary of meningitis: http://www.mayoclinic.com/health/meningitis/DS00118
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