Colorado tick fever

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Antibodies

Deer ticks

Tick imbedded in the skin

Ticks

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

Mountain tick fever; Mountain fever; American mountain fever

This disease most commonly develops from March to September, with the highest numbers of infections occurring in May and June.

Risk factors are recent outdoor activity and recent tick bite. The rate of Colorado tick fever is high in Colorado, where blood tests have shown that up to 15% of campers have previously been exposed to virus that causes the disease.

The disease is much less common in the rest of the United States.

Review Date: 08/08/2006
Reviewed By: D. Scott Smith, M.D., MSc, DTM&H, Chief of Infectious Disease & Geographic Medicine, Kaiser Redwood City, CA & Adjunct Assistant Professor, Stanford University. Review provided by VeriMed Healthcare Network.