Rash is uncommon in anaplasmosis. Some patients infected with E. chaffeensisdevelop a maculopapular or petechial rash on the trunk and extremities.
RMSF vs. Ehrlichiosis
Rash RMSF: 90% patients, petechial in 50%
HME: rash 30% and maculopapular
WBC Leukocytosis rare in either RMSF or
Leukopenia seen in Ehrlichiosis but rare
Vasculitis Hallmark of RMSF; not seen Ehrlichiosis