JIM DOWDALLS / SCIENCE PHOTO LIBRARY JIM DOWDALLS / SCIENCE PHOTO LIBRARY
Bacterial meningitis. Artwork of the brain of a person with bacterial meningitis, showing an enlarged section (lower right) of the three meninges membranes that cover and protect the brain (upper centre). It is the meninges that become inflamed during meningitis, which can be caused by bacteria or viruses. Usually, the meningitis-causing micro-organisms reach the meninges through the bloodstream from an infection elsewhere in the body. While viral meningitis is mild, bacterial meningitis is very dangerous and must be treated with large doses of intravenous antibiotics. Meningococcus sp. is the most common bacterial cause.
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