Outer envelope of virulent Treponema pallidum.
Ultrathin sections of virulent Treponema pallidum (Nichols strain) were examined with the electron microscope, and the presence of an outer cell envelope was documented.
D000818:Animals; D002473:Cell Wall; D007109:Immunity; D008297:Male; D008854:Microscopy, Electron; D011817:Rabbits; D013587:Syphilis / Q000276:immunology; D013737:Testis / Q000382:microbiology; D014210:Treponema pallidum / Q000166:cytology*; D014774:Virulence