title: New treatment for ragweed hayfever: polymerized ragweed.
mesh_terms: D000485:Allergens; D052179:Antigens, Plant; D006801:Humans; D007167:Immunotherapy; D046911:Macromolecular Substances; D008517:Phytotherapy; D010940:Plant Proteins; D011058:Pollen / Q000008:administration & dosage*; D006255:Rhinitis, Allergic, Seasonal / Q000628:therapy*
chemical_list: D000485:Allergens; C026967:Amb a I protein, Ambrosia artemisiifolia; D052179:Antigens, Plant; D046911:Macromolecular Substances; D010940:Plant Proteins