EhrlichiaEhrlichia chaffeensisEhrlichia canisEhrlichiosisEhrlichia ruminantiumRickettsiaceaeRickettsiaceae InfectionsAnaplasmaDog DiseasesTicksAnaplasmataceaeIxodesHeartwater DiseaseDogsHorse DiseasesTick-Borne DiseasesTick InfestationsAnaplasmosisRNA, Ribosomal, 16SAntibodies, BacterialPolymerase Chain ReactionMolecular Sequence DataDNA, BacterialArachnid VectorsHorsesNeorickettsiaAnaplasma phagocytophilumAntigens, BacterialRickettsiaSocial IsolationArthropod VectorsIxodidaeAnaplasmataceae InfectionsPhylogenyDeerSequence Analysis, DNABase SequenceBabesiaRickettsieaeRickettsia rickettsiiAnaplasma centraleFluorescent Antibody Technique, IndirectRhipicephalus sanguineusDNA, RibosomalBartonellaDoxycyclineSerologic TestsDisease ReservoirsBacterial ProteinsAmino Acid SequenceChromosome WalkingChaperoninsGranulocytesSpecies SpecificityBacterial Outer Membrane ProteinsReproductive IsolationSeroepidemiologic StudiesPatient IsolationAnaplasma marginaleRNA, BacterialOxytetracyclineArgasGenes, BacterialCloning, MolecularNymph