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Colorado tick fever - Overview

Alternative Names

Mountain tick fever; Mountain fever; American mountain fever

Definition of Colorado tick fever:

Colorado tick fever is an acute viral infection spread by the bite of the Dermacentor andersoni (wood) tick.

Causes, incidence, and risk factors:

This disease is usually seen between March and September. Most cases occur in April, May, and June.

Risk factors are recent outdoor activity and recent tick bite.

Colorado tick fever is seen most often in Colorado. Up to 15% of campers have been exposed to the virus that causes the disease. The disease is much less common in the rest of the United States.

  • Reviewed last on: 9/28/2008
  • Linda Vorvick, MD, Seattle Site Coordinator, Lecturer, Pathophysiology, MEDEX Northwest Division of Physician Assistant Studies, University of Washington School of Medicine; Jatin M. Vyas, MD, PhD, Instructor in Medicine, Harvard Medical School, Assistant in Medicine, Division of Infectious Disease, Massachusetts General Hospital. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

References

Naides SJ. Arthropod-borne viruses causing fever and rash syndromes. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier; 2007: chap 405.

Tsai TF. Coltiviruses and seadornaviruses (Colorado tick fever). In: Mandell GL, Bennett JE, Dolin R, eds. Principles and Practice of Infectious Diseases. 6th ed. Philadelphia, Pa: Churchill Livingstone Elsevier; 2005: chap 145.

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