title: Criteria for selection of antibiotics in empiric therapy of presumed gram negative infection.
mesh_terms: D000900:Anti-Bacterial Agents / Q000627:therapeutic use*; D001424:Bacterial Infections / Q000188:drug therapy*; D002511:Cephalosporins / Q000627:therapeutic use; D006801:Humans; D010406:Penicillins / Q000627:therapeutic use
chemical_list: D000900:Anti-Bacterial Agents; D002511:Cephalosporins; D010406:Penicillins