MORTON, H E Preliminary observations of the action of penicillin on Treponema pallidum in vivo. [electronic resource] - American journal of syphilis, gonorrhea, and venereal diseases Nov 1953 - 529-35 p. digital Publication Type: Journal Article ISSN: 0096-6738 Subjects--Topical Terms: HumansPenicillinsSyphilis--therapyTreponema pallidum--drug effects