title: Letter: Penicillin-insensitive pneumococci and pneumococcal infections.
mesh_terms: D000328:Adult; D002675:Child, Preschool; D006801:Humans; D010400:Penicillin G / Q000627:therapeutic use*; D010403:Penicillin Resistance; D011008:Pneumococcal Infections / Q000188:drug therapy*
chemical_list: D010400:Penicillin G