title: Antibodies to Ehrlichia canis, Ehrlichia platys, and spotted fever group rickettsiae in Louisiana dogs.
abstract: Antibodies to Ehrlichia canis, Ehrlichia platys, and spotted fever group (SFG) rickettsiae were detected by indirect immunofluorescence in sera from 27 ill individually owned thrombocytopenic dogs (platelet concentrations less than 200,000 platelets/microliters) and 59 healthy kenneled dogs located in southern Louisiana. Platelet concentrations less than 100,000 platelets/microliters were detected in 63% of ill thrombocytopenic dogs and 6.8% of healthy kennel dogs. One ill thrombocytopenic dog had intracytoplasmic E platys morulae detected within platelets. The prevalence of increased serum antibody titers to E canis and E platys was 25.9% and 40.7% for the ill thrombocytopenic dogs and 20.3% and 54.2% for the healthy kennel dogs, respectively. All dogs with seropositivity to E canis had increased antibody titers of greater than or equal to 1:100 to E platys. Simultaneous examination of increased serum antibody titers (greater than or equal to 1:64) to four SFG rickettsiae indicate that Rickettsia rhipicephali and Rickettsia montana accounted for the majority of the antibodies detected in these dogs. Of 86 dogs tested, 44.2% were seronegative to E canis, E platys, and SFG rickettsiae.
authors.affiliation: Department of Veterinary Clinical Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge 70803.
authors.forename: J D
authors.initials: JD
authors.lastname: Hoskins
authors.forename: E B
authors.initials: EB
authors.lastname: Breitschwerdt
authors.forename: S D
authors.initials: SD
authors.lastname: Gaunt
authors.forename: T W
authors.initials: TW
authors.lastname: French
authors.forename: W
authors.initials: W
authors.lastname: Burgdorfer
mesh_terms: D000818:Animals; D000907:Antibodies, Bacterial / Q000032:analysis*; D004283:Dog Diseases / Q000453:epidemiology* / Q000276:immunology; D004285:Dogs; D004536:Ehrlichia / Q000276:immunology*; D008145:Louisiana; D012282:Rickettsia Infections / Q000453:epidemiology / Q000276:immunology / Q000662:veterinary; D012284:Rickettsia rickettsii / Q000276:immunology*; D012287:Rickettsiaceae / Q000276:immunology*; D012288:Rickettsiaceae Infections / Q000453:epidemiology / Q000276:immunology / Q000662:veterinary*; D013921:Thrombocytopenia / Q000276:immunology / Q000662:veterinary
chemical_list: D000907:Antibodies, Bacterial