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Colorado tick fever

  • Definition

    Colorado tick fever is an acute viral infection spread by the bite of the Dermacentor andersoni wood tick.

    Alternative Names

    Mountain tick fever; Mountain fever; American mountain fever

    Causes, incidence, and risk factors

    This disease is usually seen between March and September. Most cases occur in April, May, and June.

    Risk factors are recent outdoor activity and recent tick bite.

    Colorado tick fever is seen most often in Colorado. Up to 15% of campers have been exposed to the virus that causes the disease. The disease is much less common in the rest of the United States.