Empiric drug regimens listed for the various bacterial strains are for ADULT patients with normal renal function. Review the relevant package insert for additional prescribing information.

>Coxiella burnetii
>Ehrlichia species, Anaplasma
1] Anaplasma phagocytophilum (Ehrlichia phagocytophilum)
2] Ehrlichia chaffeensis
3] Ehrlichia ewingii
4] Ehrlichia ewubguum



  • (non-motile, Gram-negative, non-sporeforming bacteria).
  • Highly pleomorphic:  can present as cocci (0.1 µm in diameter), rods (1-4 µm long) or thread-like (10 µm long).
  • Obligate intracellular parasite. Survival depends on entry, growth, and replication within the cytoplasm of eukaryotic host cells.
  • –Unlike Chlamydia, Mycoplasma, and Ureaplasma, Rickettsial organisms possess true cell walls similar to other Gram-negative bacteria.
  • Frequently carried by chiggers, ticks, fleas, and lice.
  • Causative organism in typhus, rickettsial pox, Boutonneuse fever, African tick bite fever, Rocky Mountain spotted fever, Flinders Island spotted fever and Queensland tick typhus.
Ehrlichia species