title: Ehrlichia canis-related polyarthritis in a dog.
abstract: Ehrlichia canis-related polyarthritis was diagnosed in a 7-month-old Boxer. The diagnosis was based on intraneutrophilic morulae found in synovial fluid specimens, thrombocytopenia, a positive result for indirect fluorescent antibody testing for E canis, the presence on the dog of the known vector of E canis infection (Rhipicephalus sanguineus), and a favorable response to treatment with tetracycline hydrochloride. The dog has had no recurrence of lameness for 18 months after cessation of treatment.
mesh_terms: D000818:Animals; D001168:Arthritis / Q000209:etiology / Q000662:veterinary*; D004283:Dog Diseases; D004285:Dogs; D004536:Ehrlichia; D005455:Fluorescent Antibody Technique; D009504:Neutrophils / Q000382:microbiology; D012288:Rickettsiaceae Infections / Q000662:veterinary*; D013582:Synovial Fluid / Q000166:cytology; D013987:Ticks