title: Letter: Upper respiratory tract protocol.
mesh_terms: D006801:Humans; D010406:Penicillins / Q000627:therapeutic use; D012141:Respiratory Tract Infections / Q000188:drug therapy / Q000382:microbiology; D013290:Streptococcal Infections / Q000175:diagnosis / Q000188:drug therapy
chemical_list: D010406:Penicillins