Ehrlichiosis is an infectious disease that can be passed to humans by ticks. It causes fever, chills, headache (often severe), general ill feeling (malaise), nausea and vomiting, and a purple or red rash.

Symptoms usually start from 1 to 2 weeks after the tick bite. Ehrlichiosis is usually treated with prescription medicine.

The disease most frequently occurs in the south-central, southeastern, and mid-Atlantic states.