| a usually mild viral disease occurring in the Rocky Mountain regions of the United States, carried by a tick, Dermacentor andersoni, and characterized by fever, sensitivity to light, headache, and leg and back pain. |

Colorado tick fever Col·o·ra·do tick fever (kŏl'ə-rād'ō, -rä'dō)
n.
A viral infection transmitted to humans by the tick Dermacentor andersoni and characterized by mild symptoms and intermittent fever.