Colorado tick fever
- Abbreviation: CTF
- Also called mountain tick fever, American tick fever
- Caused by RNA virus of genus Coltivirus in family Reoviridae
- Principal vector is Rocky Mountain wood tick (Dermacentor andersoni)
- Principal zoonotic reservoirs include deer, marmots, porcupines
- Endemic in western mountainous regions of the U.S. and Canada (e.g. Colorado, Idaho)
- Develops March to September, most cases occur in April, May, June
- Incubation time ranges from 1-14 days
- Onset of illness characterized by fever (may be biphasic), chills, headache, myalgias, malaise, photophobia
- Less commonly sore throat, vomiting, abdominal pain, skin rash (macular or petechial)
- Rarely, patients may develop severe illness that affects central nervous system with symptoms including neck stiffness and confusion
- Clinical diagnosis
- Supportive care
- Colorado tick fever. MedlinePlus. https://medlineplus.gov/ency/article/000675.htm. Retrieved 9/9/2017.
- Colorado tick fever. Center for Disease Control and Prevention. 13 Jan 2015. https://www.cdc.gov/coloradotickfever/symptoms-treatment.html. Retrieved 9/9/2017.