An infected person may have encephalitis-like symptoms with confusion and delirium. Coma, seizures, paralysis, and other signs of neurological loss are found in more serious forms. Most people recover in a few days or weeks with no long-term problems.
The most common diseases caused by acute viral infections are encephalitis, flaccid paralysis, aseptic and postinfectious meningitis, and encephalomyelitis.
The swelling of the brain can last from a few days to two to three months. After this, most people find that they fully recover from their symptoms in two to three months.