Encephalitis - Brain, Spinal Cord, and Nerve Disorders - Merck …
https://www.merckmanuals.com/home/brain,-spinal-cord,-and-nerve-disorders/brain-infections/encephalitis
WebEncephalitis is inflammation of the brain that occurs when a virus directly infects the brain or when a virus, vaccine, or something else triggers inflammation. The spinal cord may also be involved, resulting in a disorder called encephalomyelitis. People may have a fever, headache, or seizures, and they may feel sleepy, numb, or confused.
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