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Colorado Tick Fever
Aka: Colorado Tick Fever
- See Also
- Tick-Borne Disease
- Vector Borne Disease
- Prevention of Tick-borne Infection
- Tick Removal
- Epidemiology
- Incidence: 200 to 300 cases per year
- Region: Most common in Rocky Mountains
- Pathophysiology
- Cause: RNA orbivirus
- Transmission
- Dermacentor andersoni (wood Tick Bite)
- Infected Blood Transfusion
- Risk Factors for severe infection
- Asplenic patients
- Immunocompromised patients
- Symptoms: Influenza-like illness
- Timing
- Onset 3-5 days after inoculation (Tick Bite)
- Symptom duration 7-10 days
- Pharyngitis
- Biphasic high fever (saddle-back fever)
- Meningitis
- Rash
- Conjunctivitis
- Photophobia
- Retro-orbital Headache
- Diagnosis
- Serology
- Confirms diagnosis at 2-4 weeks
- PCR
- Reverse-transcriptase PCR can make the diagnosis within days of onset
- Differential Diagnosis
- Tick-Borne Disease
- Labs
- Blood smear with immunofluorescent stain for virus
- Complete Blood Count
- Leukopenia
- Thrombocytopenia
- Management
- Symptomatic (self-limited, no specific treatment exists)
- Complications: Uncommon
- Encephalitis
- Myocarditis
- Pneumonitis
- Hepatitis
- Disseminated Intravascular Coagulation
- References
- Pace (2020) Am Fam Physician 101(9): 530-40 [PubMed]