Encephalitis
usually occurs 10-14 days after vaccination. It is difficult
to delineate the clinical spectrum because of the potential
confusion with other causes of encephalitis in reported
cases.
Headache, vomiting, drowsiness and fever are the first
symptoms observed and may be all that is seen in mild
cases with rapid recovery. In more severe cases, symptoms
progress to include paralysis, incontinence, urinary
retention, and various forms of convulsions.
Death can occur suddenly, usually within a week of onset
of symptoms.
Many patients recover completely without discernible
residua. Some patients experience a variety of neurologic
sequelae.
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