Colorado tick fever

Viral Diseases

Animals Involved

Rodents; also found in porcupines, lagomorphs, deer, elk, and other mammals

Known Distributions

Rocky Mountain region of North America

Probable Means of Spreading

Tick bites (primary vector is Dermacentor andersoni)

Clinical Manifestations in People

Nonspecific febrile illness; pharyngitis, rash, or GI signs possible; biphasic or triphasic in some; complications (eg, neurologic signs, hemorrhages, pericarditis, myocarditis, orchitis) uncommon but can occur in severe cases; deaths rare

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