Symptoms of Colorado tick fever include fever, chills, headache, body aches, and feeling tired. Approximately half of all cases will have several days of fever, then feel better for several days, then a second period of fever and illness. There are no preventative medications or vaccines. Symptoms typically occur between 1 and 14 days post tick bite. Most infections result in mild symptoms with complete recovery. Some cases may last several weeks. A healthcare professional will diagnose and treat Colorado tick fever based on clinical symptoms and history of tick bite while the individual was in elevations between 4,000 and 10,000 feet.