What is the US prevalence of 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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The virus that causes Colorado tick fever is the second most common arbovirus after West Nile virus in the United States. Several hundred cases are reported to the Centers for Disease Control and Prevention (CDC) annually. It has been found in California, Colorado, Idaho, Montana, Nevada, New Mexico, Oregon, South Dakota, Utah, Washington, and Wyoming, as well as the Canadian provinces of British Columbia and Alberta.

In endemic areas, the disease is usually limited to elevations higher than 4,000 feet. Most cases occur from May to July, corresponding to the level of activity of the D andersoni tick. [6]  Reporting is not mandatory, however, so the number of reported cases could be a fraction of the actual exposures.

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