Bacterium responsible for syphilis. Electron micrograph of Treponema pallidum on cultures of cotton-tail rabbit epithelium cells (Sf1Ep).Treponema pallidum is the causative agent of syphilis. In the United States, over 35,600 cases of syphilis were repor

horizontal result bacterium gram negative microaerophilic spirochete spirochaetales spirochaetaceae treponema treponema treponema pallidum treponema pallidum texture culture scientific imagery microscope electronic microscope sem medicine spirochetosis treponematosis sexually transmitted disease syphilis bacteriology microbiology microorganism unicellular organism