Colorado tick fever virus is a viral infection transmitted by the bite of infected wood ticks, primarily Dermacentor andersoni. It is most commonly found in the western United States and Canada, especially in mountainous areas. The virus can cause flu-like symptoms, including fever, headache, and muscle aches, typically lasting about a week. Most people recover fully without complications, but severe cases can occur, particularly in individuals with weakened immune systems. There is no specific treatment for Colorado tick fever, so prevention focuses on avoiding tick bites through protective clothing and insect repellent when in tick-prone areas.