Infection on a surgical service. Present incidence compared with that of 1957.
D000667:Ampicillin / Q000627:therapeutic use; D000900:Anti-Bacterial Agents / Q000627:therapeutic use; D002170:Canada; D003428:Cross Infection / Q000188:drug therapy / Q000453:epidemiology*; D006801:Humans; D010403:Penicillin Resistance; D013203:Staphylococcal Infections / Q000188:drug therapy / Q000453:epidemiology*; D013223:Statistics as Topic; D013530:Surgical Wound Infection / Q000453:epidemiology*