Infectious Disease Book

http://www.fpnotebook.com/

Colorado Tick Fever

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  1. Epidemiology
    1. Incidence: 200 to 300 cases per year
    2. Region: Most common in Rocky Mountains
  2. Pathophysiology
    1. Cause: RNA orbivirus
    2. Transmission: Dermacentor andersoni (wood tick)
  3. Risk Factors for severe infection
    1. Asplenic patients
    2. Immunocompromised patients
  4. Symptoms: Influenza-like illness
    1. Onset one week after inoculation
    2. Pharyngitis
    3. Biphasic fever
    4. Meningitis
    5. Rash
    6. Conjunctivitis
  5. Differential Diagnosis
    1. Tick-Borne Disease
  6. Labs
    1. Blood smear with immunofluorescent stain for virus
    2. Complete Blood Count
      1. Leukopenia
      2. Thrombocytopenia
  7. Management
    1. Symptomatic (no specific treatment exists)

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