Deer Tick

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Colorado Tick Fever


An acute viral infection transmitted by the bite of the tick Dermacentor andersoni, Colorado Tick Fever is also called Mountain tick fever,  Mountain fever and American mountain fever.

The disease is limited to the western U.S. and is most prevalent during March to September, especially in May and June. The incubation period is 3 to 6 days. Symptoms of fever continue for 3 days, then abate and recur 1 to 3 days later for another few days. Risk factors are recent outdoor activity and recent tick bite. The incidence is high in Colorado, where up to 15% of regular campers show past exposure (based on antibodies). It is much lower throughout the rest of the U.S.


Rocky Mountain Wood Tick (Dermacentor andersoni)

Causative Agent:

Colorado Tick Fever Virus


Endemic Area:

Western United States

Incubation Period:

4-5 days

Classic Symptoms:

Fever with remission, then a second bout of fever

Lab Test(s):




Search the Center for Disease Control, The National Institute of Health or PubMed for more information on Colorado Tick Fever.

Source: Dutchess County DOH, National Institute of Health








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