Ehrlichia chaffeensis ehrlichiosis classically presents with fever, headache, and a triad of laboratory findings: leukopenia, thrombocytopenia, and elevated transaminases. A summer febrile illness in the southeastern United States with that triad should prompt empirical doxycycline pending serology - waiting for confirmation can be fatal.
Ehrlichia ewingii ehrlichiosis was first recognized in human disease in 1999, almost exclusively in immunocompromised patients - HIV,…
Ehrlichia chaffeensis and Anaplasma phagocytophilum cause clinically similar diseases but parasitize different white blood cells.…
CDC's surveillance category undetermined ehrlichiosis or anaplasmosis exists because the two diseases share clinical presentation,…
When a clinician suspects ehrlichiosis or anaplasmosis but the antibody titers are too cross-reactive to call, PCR on whole blood drawn…
Rickettsia parkeri rickettsiosis, transmitted by the Gulf Coast tick, causes fever, headache, and a near-pathognomonic black eschar at the…
A single tick species, Amblyomma americanum, transmits ehrlichiosis from Ehrlichia chaffeensis and E. ewingii, tularemia, Heartland virus,…