Disease Information for Encephalitis, Western equine: Definition

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  • A form of arboviral encephalitis (which primarily affects horses) endemic to western and central regions of NORTH AMERICA; The causative organism (ENCEPHALOMYELITIS VIRUS, WESTERN EQUINE) may be transferred to humans via the bite of mosquitoes (CULEX tarsalis and others); Clinical manifestations include headache and influenza-like symptoms followed by alterations in mentation, SEIZURES, and COMA; DEATH occurs in a minority of cases; Survivors may recover fully or be left with residual neurologic dysfunction, including PARKINSONISM, POSTENCEPHALITIC---(From Joynt, Clinical Neurology, 1996, Ch26, pp8-9)-----------

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