Introduction of penicillin in syphilotherapy.
D049673:History, 20th Century; D006801:Humans; D010406:Penicillins / Q000266:history* / Q000627:therapeutic use; D013587:Syphilis / Q000188:drug therapy / Q000266:history*; D014481:United States; D014492:United States Public Health Service
D010406:Penicillins