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Risk factors
By Mayo Clinic staffEhrlichiosis spreads when an infected tick, primarily the Lone Star tick, bites you and feeds on you for 24 hours or longer. The following factors may increase your risk of getting tick-borne infections:
- Being outdoors in warm weather. Most cases of ehrlichiosis occur in the spring and summer months when populations of the Lone Star tick are at their peak and people are outside for activities such as hiking, golfing, gardening and camping.
- Living in or visiting an area with a high tick population. You are at greater risk if you are in an area with a high Lone Star tick population. In the United States, Lone Star ticks are most common in southeastern, eastern and south-central states.
- Being male. Ehrlichiosis infections are more common in males, likely because of increased time outdoors for work and recreation.
References
- Sexton DJ. Human ehrlichiosis and anaplasmosis. http://www.uptodate.com/home/index.html. Accessed Jan. 29, 2010.
- Prevention and control. Centers for Disease Control and Prevention. http://www.cdc.gov/ticks/prevention.html. Accessed Feb. 24, 2010.
- Questions and answers. Centers for Disease Control and Prevention. http://www.cdc.gov/ticks/diseases/ehrlichiosis/faq.html. Accessed Feb. 24, 2010.
- Stone JH, et al. Human monocytic ehrlichiosis. Journal of the American Medical Association. 2004;292:2263.
- Ganguly S, et al. Tick-borne ehrlichiosis infection in human beings. Journal of Vector Borne Disease. 2008;45:273.
- Walker DH, et al. Rickettsial diseases. In: Fauci AS, et al. Harrison's Principles of Internal Medicine. 17th ed. New York, N.Y.: McGraw-Hill Medical; 2008. http://www.accessmedicine.com/content.aspx?aID=2898577. Accessed Feb. 25, 2010.
- Elston DM. Tick bites and skin rashes. Current Opinion in Infectious Diseases. In press. Accessed Feb. 24, 2010.
- Other tick-borne diseases. American Lyme Disease Foundation. http://www.aldf.com/Ehrlichiosis.shtml. Accessed Feb. 25, 2010.
- Removing ticks. Centers for Disease Control and Prevention. http://www.cdc.gov/ticks/tick_removal.html. Accessed Feb. 25, 2010.
- Prevention of tickborne infections. American Academy of Pediatrics. http://aapredbook.aappublications.org/cgi/content/full/2009/1/2.13?maxtoshow=&hits=10&RESULTFORMAT=&fulltext=prevention+of+tickborne&searchid=1&FIRSTINDEX=0&volume=2009&issue=1&resourcetype=HWCIT. Accessed Feb. 26, 2010.
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