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St. Louis Encephalitis Symptoms & Diagnosis


St. Louis encephalitis can result in a wide range of symptoms, or produce no symptoms at all. The disease can be mild, severe, or even fatal. The disease is fatal in 3%-30% of people who develop symptoms. Symptoms associated with St. Louis encephalitis usually appear 5-15 days after the bite of an infected mosquito and may include:

  • Headache
  • Fever
  • Neck stiffness
  • Stupor
  • Disorientation
  • Coma
  • Tremors
  • Convulsions (especially in infants)
  • Paralysis


Your doctor will ask about your symptoms and medical history, and perform a physical exam. He or she will also perform blood tests to identify the virus.

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St. Louis Encephalitis Guide

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