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The page below is a sample from the LabCE course Tickborne Diseases. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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Ehrlichiosis: Clinical Manifestations

Ehrlichia chaffeensis multiplies in the phagosome of leukocytes, particularly monocytes. Infection may be asymptomatic or present with headache, high fever, myalgia, and malaise. Children are more likely to present with a rash (66%) than adults (33%). Gastrointestinal symptoms are also more likely in children. The maculopapular rash is seen less commonly on the palms and soles than with Rocky Mountain spotted fever (RMSF), but symptoms may be very similar between RMSF, ehrlichiosis, and anaplasmosis. Erhlichiosis can cause serious or fatal disease, but not as frequently as RMSF. Only about 50% of patients are hospitalized and the fatality rate is low (3%) and primarily seen in immunosuppressed and asplenic patients.