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IV. Encephalitis
A. Pathogenesis:
B. Etiologic Agents:
- Usually viral: important organisms include HIV, polio, rabies, Herpes simplex, Herpes zoster, equine encephalitis and St. Louis encephalitis viruses.
- Rickettsia (typhus and Rocky Mountain spotted fever) and protozoa (toxoplasma) also cause a diffuse inflammatory reaction in the central nervous system.
- Bacterial invasion of the CNS typically results in abscess formation, not encephalitis or encephalomyelitis.
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