Colorado Tick Fever (CTF)

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Colorado Tick Fever (CTF) is a rare viral disease spread by the bite of an infected Rocky Mountain wood tick found in the western United States and western Canada. There are no vaccines to prevent or medicines to treat CTF. You can reduce your risk of infection by avoiding ticks.

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Frequently Asked Questions
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Prevention
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Symptoms & Treatment
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Transmission
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For Healthcare Providers
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Links & References
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Transmission
Ticks infected by small rodents spread CTF…
Transmission electron microscopic (TEM) image of Colorado tick fever virus
Virus
Learn more about CTF virus…
Approximate geographic distribution of Dermacentor andersoni ticks and counties of residence for laboratory-confirmed Colorado tick fever virus disease cases, United States, 2002–2012 - Cases are concentrated in the Western United States
Statistics & Maps
See where cases have occurred…
Page last reviewed: March 17, 2021
Content source: Centers for Disease Control and Prevention, National Center for Emerging and Zoonotic Infectious Diseases (NCEZID), Division of Vector-Borne Diseases (DVBD)