Bacterial meningitis. Artwork of Neisseria meningitidis (round, yellow), the bacteria that causes meningococcal meningitis. N. meningitidis is shown leaving the blood vessels (purple) in the choroid plexus of the brain, where it intermingles with blood cells in the cerebrospinal fluid. The bacteria then circulate around the membranous meningeal layer of the central nervous system, causing swelling and inflammation. In the foreground, one bacterium has attached itself to an epithelial cell in the choroid plexus. Bacterial meningitis is very dangerous and must be treated with large doses of intravenous antibiotics.
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