Colorado Tick Fever: Epidemiology

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The page below is a sample from the LabCE course Tickborne Diseases. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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Colorado Tick Fever: Epidemiology

The vector of Colorado tick fever is Dermacentor andersoni, the Rocky Mountain wood tick found in small mammals. The virus is an RNA virus of the genus Coltivirus. This intraerythrocytic arbovirus is located in the Western United States at altitudes of 4,000 to 10,000 feet. There were 223 cases reported between 2003 and 2022, but only ten states require reporting. Reporting is voluntary in other states.
Figure 40. Centers for Disease Control and Prevention. (2024). Geographic distribution of Rocky mountain wood ticks and counties of residence for Colorado tick fever cases from 2013–2022. [Image]. https://www.cdc.gov/colorado-tick-fever/data-maps/index.html.
Figure 41. Centers for Disease Control and Prevention. (2024). Transmission graphic for Colorado tick fever virus.[Image]. https://www.cdc.gov/colorado-tick-fever/php/transmission/index.html.

Figure 40. Colorado tick fever distribution and reported cases, 2013-2022
Figure 41. Transmission of Colorado tick fever virus