<unk>  is a condition in which the layers lining the brain, or meninges, become inflamed due to a<unk>  infection. Meningitis is diagnosed on a history of characteristic symptoms and certain examination findings (e.g. Kernig's sign). Investigations should show an increase in the number of leukocytes present in the cerebrospinal fluid (CSF), obtained via lumbar puncture.
Viral meningitis
Fungal meningitis
Neoplastic meningitis
Tuberculous meningitis
Herpes simplex encephalitis
Mollaret's meningitis
Japanese encephalitis
Varicella zoster encephalitis