What is Colorado tick fever?

Updated: Aug 05, 2019
  • Author: Shawn J Sethi, DO; Chief Editor: Jeter (Jay) Pritchard Taylor, III, MD  more...
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Colorado tick fever is a viral infection transmitted by the bite of the tick Dermacentor andersoni. The disease occurs almost exclusively in the western United States and southwestern [1] Canada. A nonspecific febrile illness is the most common manifestation, but the virus occasionally targets other organ systems. [2, 3]

The essential management decision is to determine whether a serious treatable infection exists. Administration of fluids and antipyretics may also be necessary for supportive care. A skin examination should be completed, and, if the tick is still attached to the patient, it should be removed.

For patient education resources, see the Bites and Stings Center, as well as Ticks.

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