Ehrlichiosis 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:
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- 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 more often.
- 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, possibly because of increased time outdoors for work and recreation.
- Tickborne diseases of the United States — A reference manual for health care providers. Centers for Disease Control and Prevention. http://www.cdc.gov/lyme/healthcare/clinicians.html. Accessed June 10, 2015.
- Sexton DJ. Human ehrlichiosis and anaplasmosis. http://www.uptodate.com/home. Accessed June 10, 2015.
- Ferri FF. Ehrlichiosis and anaplasmosis. In: Ferri's Clinical Advisor 2016. Philadelphia, Pa.: Mosby Elsevier; 2016. https://www.clinicalkey.com. Accessed June 10, 2015.
- Papadakis MA, et al., eds. Viral & rickettsial infections. In: Current Medical Diagnosis & Treatment 2015. 54th ed. New York, N.Y.: The McGraw-Hill Companies; 2015. http://www.accessmedicine.com. Accessed June 10, 2015.
- Lyme disease. American Lyme Disease Foundation. http://aldf.com/lyme-disease/#prevent. Accessed June 20, 2015.
- Preventing tick bites. Centers for Disease Control and Prevention. http://www.cdc.gov/lyme/prev/index.html. Accessed June 10, 2015.