title: Immunotherapy of hay fever with ragweed antigen E: comparisons with whole pollen extract and placebos.
mesh_terms: D000328:Adult; D000941:Antigens; D002986:Clinical Trials as Topic; D003888:Desensitization, Immunologic; D006801:Humans; D010919:Placebos; D010936:Plant Extracts / Q000627:therapeutic use; D011058:Pollen; D006255:Rhinitis, Allergic, Seasonal / Q000188:drug therapy*; D012621:Seasons
chemical_list: D000941:Antigens; D010919:Placebos; D010936:Plant Extracts