title: STUDIES ON BACTERIA DEVELOPING RESISTANCE TO PENICILLIN FRACTIONS X AND G IN VITRO AND IN PATIENTS UNDER TREATMENT FOR BACTERIAL ENDOCARDITIS.
authors.affiliation: George Washington Medical Division, Gallinger Municipal Hospital, Washington.
authors.forename: H F
authors.initials: HF
authors.lastname: Dowling
authors.forename: H L
authors.initials: HL
authors.lastname: Hirsh
authors.forename: C B
authors.initials: CB
authors.lastname: O'neil
mesh_terms: D001419:Bacteria; D004696:Endocarditis / Q000628:therapy*; D004697:Endocarditis, Bacterial; D006801:Humans; D066298:In Vitro Techniques; D010400:Penicillin G / Q000031:analogs & derivatives
chemical_list: D010400:Penicillin G; C037825:penicillin X