Symptoms, Diagnosis, & Treatment

Symptoms

  • Many people infected with Jamestown Canyon virus do not have symptoms.
  • For people with symptoms, the time from mosquito bite to feeling sick ranges from a few days to 2 weeks.
  • Initial symptoms can include fever, fatigue, and headache. Some people also have respiratory symptoms such as cough, sore throat, or runny nose.
  • Jamestown Canyon virus can cause severe disease, including infection of the brain (encephalitis) or the membranes around the brain and spinal cord (meningitis).
  • Symptoms of encephalitis or meningitis include stiff neck, confusion, loss of coordination, difficulty speaking, or seizures.
  • About half of patients reported with Jamestown Canyon virus disease are hospitalized.
  • Deaths associated with Jamestown Canyon virus infection are rare.

Diagnosis

  • See your healthcare provider if you develop the symptoms described above.
  • Your healthcare provider can order tests to look for Jamestown Canyon virus infection.
  • More information on diagnostic testing is available on the “For Healthcare Providers” page.

Treatment

  • There is no medicine to treat Jamestown Canyon virus infection.
  • Treat the symptoms:
    • Get plenty of rest.
    • Drink fluids to prevent dehydration.
    • Take over-the-counter pain relievers to reduce fever.
  • Some patients with severe symptoms may need to be hospitalized.
Page last reviewed: November 27, 2019
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