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Encephalitis is an inflammation of the brain, usually caused by a direct viral infection or a hypersensitivity reaction to a virus or foreign protein.
Primary encephalitis is caused by direct infection by the virus, while secondary encephalitis is due to a post-infectious immune reaction to viral infection elsewhere in the body.
Herpes simplex encephalitis is responsible for 10% of all encephalitis cases and is the main cause of sporadic, fatal encephalitis.
equineencephalitis [ E ´kw I n ensef´´ u l I ´tis] Pronunciation Key, infectious disease of horses caused by any of several viruses, four of which : the Eastern, Western, Venezuelan, and St. Louis viruses : can also infect humans.
The symptoms of equineencephalitis include fever, drowsiness, and incoordination, often followed by paralysis and death.
Equineencephalitis is a serious public-health problem in N South America.