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Western Equine Encephalitis Symptoms & Diagnosis


WEE results in a wide range of symptoms and may produce no symptoms at all. The disease can be mild, severe, or even fatal. The disease is fatal in about 3% of people who develop symptoms. Symptoms associated with WEE usually appear 5-10 days after the bite of an infected mosquito and may include:

  • Headache
  • Fever
  • Drowsiness
  • Irritability
  • Nausea
  • Vomiting
  • Confusion
  • Weakness
  • Coma
  • Seizures (in young infants)


Your doctor will ask about your symptoms and medical history, and perform a physical exam. Other tests may include:

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Western Equine Encephalitis Guide

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