title: Hemagglutination titer changes of pollinosis patients treated with alum-precipitated pyridine ragweed extract.
mesh_terms: D000917:Antibody Formation; D003888:Desensitization, Immunologic; D006386:Hemagglutination Tests; D006801:Humans; D008517:Phytotherapy; D010936:Plant Extracts / Q000627:therapeutic use; D011058:Pollen / Q000627:therapeutic use*; D011725:Pyridines; D006255:Rhinitis, Allergic, Seasonal / Q000276:immunology* / Q000628:therapy; D012882:Skin Tests
chemical_list: D010936:Plant Extracts; D011725:Pyridines