EhrlichiaEhrlichia chaffeensisEhrlichia canisEhrlichiosisEhrlichia ruminantiumRickettsiaceaeRickettsiaceae InfectionsAnaplasmaDog DiseasesTicksAnaplasmataceaeIxodesHeartwater DiseaseDogsTick-Borne DiseasesHorse DiseasesRNA, Ribosomal, 16STick InfestationsAnaplasmosisAntibodies, BacterialDNA, BacterialPolymerase Chain ReactionMolecular Sequence DataArachnid VectorsHorsesNeorickettsiaAnaplasma phagocytophilumPhylogenyAntigens, BacterialRickettsiaArthropod VectorsSequence Analysis, DNAIxodidaeAnaplasmataceae InfectionsBabesiaDNA, RibosomalDeerBacterial ProteinsRickettsia rickettsiiRhipicephalus sanguineusSpecies SpecificityRickettsieaeBartonellaAnaplasma centraleDoxycyclineBase SequenceFluorescent Antibody Technique, IndirectDisease ReservoirsSerologic TestsChaperoninsRNA, BacterialChromosome WalkingGranulocytesBacterial Outer Membrane ProteinsGenes, BacterialSeroepidemiologic StudiesOxytetracyclineDirofilaria immitisAnaplasma marginaleBabesiosisAmino Acid SequenceArgasNymph