The disease is limited to the western U.S. and is most prevalent during March to August, the tick season. 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 4 out of 100,000 people. Colorado tick fever Please read this Important notice . Please read it.