title: Causative agent of Potomac horse fever.
mesh_terms: D000818:Animals; D004536:Ehrlichia / Q000302:isolation & purification*; D006734:Horse Diseases / Q000382:microbiology*; D006736:Horses; D012287:Rickettsiaceae / Q000302:isolation & purification*; D012288:Rickettsiaceae Infections / Q000662:veterinary*