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 21 days (average of 7 days) after
the tick bite. Ehrlichiosis is usually treated with prescription
The disease most frequently occurs in the southern and
south-central United States, especially in Georgia, Missouri, and
William H. Blahd, Jr., MD, FACEP - Emergency Medicine & H. Michael O'Connor, MD - Emergency Medicine & W. David Colby IV, MSc, MD, FRCPC - Infectious Disease
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