RickettsiaRickettsia rickettsiiRickettsia InfectionsRickettsia prowazekiiPhylogenyRickettsia felisTyphus, Epidemic Louse-BorneRocky Mountain Spotted FeverBoutonneuse FeverOrientia tsutsugamushiTyphus, Endemic Flea-BorneTicksSiphonapteraDermacentorIxodidaeTick-Borne DiseasesRNA, Ribosomal, 16SCoxiellaDNA, BacterialRickettsiaceaeDNA, RibosomalRickettsieaeRickettsiaceae InfectionsSequence Analysis, DNA