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Etymology: Gk, herpein, to creep + enkephalos, brain + itis, inflammation
the most common form of acute encephalitis, caused by a herpesvirus and characterized by hemorrhagic necrosis of parts of the temporal and frontal lobes. Onset is over several days and involves fever, headache, seizures, stupor, and often coma, frequently with a fatal outcome.
Encephalitis caused by infection of the brain with herpes simplex virus-1 (or, less often, herpes simplex virus-2). This relatively common form of encephalitis typically involves the inferior surfaces of the temporal lobes and may cause hemorrhagic necrosis of brain tissue. It is fatal in at least one third of all cases. Acyclovir (or an analog) is used to treat the infection.
See also: encephalitis