Why has Swann failed?
D000818:Animals; D000900:Anti-Bacterial Agents / Q000627:therapeutic use; D002417:Cattle; D002675:Child, Preschool; D004352:Drug Resistance, Microbial; D004363:Drug Utilization; D006801:Humans; D007880:Legislation, Drug; D012480:Salmonella Infections / Q000517:prevention & control*; D012486:Salmonella typhimurium / Q000187:drug effects*
D000900:Anti-Bacterial Agents