Colorado Tick Fever

Colorado tick fever is caused by an RNA virus of the genus Coltivirus 

-It is transmitted by infected wood ticks (Dermacentor andersoni) in the northern Rocky mountain states 

-Typical patient is a young male hiking at high altitudes 

Symptoms & Signs

Sudden onset with diphasic fever, myalgia, headache, joint pains, fatigue, and nausea 


RT-PCR assays can detect viral RNA in red blood cells and in plasma


-Usually self-limited illness, supportive care