title: Letter: Cephalosporins.
mesh_terms: D002506:Cephalexin / Q000627:therapeutic use*; D002511:Cephalosporins / Q000627:therapeutic use*; D006801:Humans; D012141:Respiratory Tract Infections / Q000188:drug therapy
chemical_list: D002511:Cephalosporins; D002506:Cephalexin