Syphilis bacterium. Treponema pallidum subsp pallidum on cultures of cotton tail rabbit epithelium cells Sf1Ep

horizontal result bacterium gram negative microaerophilic spirochete spirochaetales spirochaetaceae treponema treponema treponema pallidum treponema pallidum scientific imagery microscope electronic microscope tem medicine infection bacterial infection spirochetosis treponematosis sexually transmitted disease syphilis bacteriology flagellum axial filament microbiology microorganism unicellular organism