Johnson R C, Ritzi D M, Livermore B P
Infect Immun. 1973 Aug;8(2):291-5. doi: 10.1128/iai.8.2.291-295.1973.
Ultrathin sections of virulent Treponema pallidum (Nichols strain) were examined with the electron microscope, and the presence of an outer cell envelope was documented.
用电子显微镜检查了强毒梅毒螺旋体(Nichols株)的超薄切片,并证实存在外部细胞包膜。