Position in a system
| system | Vitae - living organisms |
| domain | Bacteria (Haeckel, 1894) Woese, Kandler Wheelis, 1990 - bacterians |
| phylum | Spirochaetae Cavalier-Smith, 2002 |
| class | Spirochaetes Cavalier-Smith, 2002 |
| order | Spirochaetales Buchanan, 1917 |
| family | Spirochaetaceae Swellengrebel, 1907 |
| genus | Treponema Schaudinn, 1905 |
| species | Treponema pallidum (Schaudinn & Hoffmann, 1905) Schaudinn, 1905 |
| subspecies | Treponema pallidum endemicum |