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Disease overviewUnited States

What is ehrlichiosis?

Ehrlichiosis is a group of bacterial illnesses spread through infected tick bites. Symptoms commonly include fever, headache, muscle aches and sometimes a rash.

Reviewed by VuxLore® Knowledge Team For Everyone

Short answer

Ehrlichiosis is a group of bacterial illnesses spread through infected tick bites. Symptoms commonly include fever, headache, muscle aches and sometimes a rash.

At a glance

Early symptoms are not unique to ehrlichiosis, so recent tick exposure and travel should be shared promptly with a clinician.

Key takeaways

• Different Ehrlichia species and tick vectors are involved.

• Illness can become severe if treatment is delayed.

• Professional diagnosis is essential.

More than one organism

In the United States, ehrlichiosis includes infections caused by several Ehrlichia species. The lone star tick is an important vector for some of them, while regional patterns differ.

Early action is important

Laboratory results may not be immediately conclusive. A qualified clinician interprets symptoms, exposure, location and tests and decides whether prompt treatment is needed.

Sources and further reading

US Centers for Disease Control and Prevention: About Ehrlichiosis

US Centers for Disease Control and Prevention: Tickborne Diseases of the United States