- High fever
- Double vision
- Delayed physical and mental response
In acute cases, patients may enter a coma.
People with encephalitis lethargica may also experience:
- Abnormal eye movements
- Upper body weakness
- Muscle pains
- Neck rigidity
- Behavioral changes (including psychosis).
What Causes Encephalitis Lethargica?
Have There Been Any Epidemics?
Between 1917 and 1928, an epidemic of encephalitis lethargica spread throughout the world, but no recurrence of the epidemic has since been reported.
Postencephalitic Parkinson's disease
may develop after a bout of encephalitis lethargica -- sometimes as long as a year after the illness.
Treating Encephalitis Lethargica
Treatment for encephalitis lethargica is based on the symptoms a person experiences. Levodopa and other antiparkinson drugs often produce dramatic responses in people with this condition.
The course of encephalitis lethargica varies, depending upon complications or accompanying disorders.