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Risk factors
By Mayo Clinic staffEhrlichiosis is spread by a bite from an infected tick, primarily the Lone Star tick. Tick-borne infections cannot spread directly from person to person. The following factors may increase your risk of getting tick-borne infections:
- Being outdoors in warm weather. Most cases of ehrlichiosis occur from May to July when populations of the Lone Star tick are at their peak and people are outside for activities such as hiking, 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 and midwestern states, particularly Arkansas, Florida, Georgia, Missouri, North Carolina, Oklahoma, Tennessee, Texas and Virginia. However, cases of ehrlichiosis have been reported in all states.
- Age. You can get ehrlichiosis at any age, but most cases of infection are in adults.
