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Partially treated bacterial meningitis
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Viral meningitis
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Tuberculous meningitis
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Spirochaetes: syphilis, Lyme disease, leptospirosis
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Other bacteria—for example, brucellosis, mycoplasma
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Cerebral malaria
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Fungal meningitis
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Parameningeal infection (spinal or intracranial abscess, venous sinus thrombosis, occult paranasal sinus infection)
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Endocarditis
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Malignant meningitis (carcinoma, lymphoma, leukaemia)
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Subarachnoid haemorrhage
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Chemical meningitis (see text)
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Sarcoidosis
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Other chronic inflammatory diseases (see text)
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Drugs
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Mollaret’s meningitis (see text)
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