title: Maintenance immunotherapy in ragweed hay fever. Booster injections at six week intervals.
mesh_terms: D000906:Antibodies; D000941:Antigens; D003888:Desensitization, Immunologic; D006636:Histamine Release; D006801:Humans; D007115:Immunization Schedule; D007962:Leukocytes / Q000276:immunology; D010919:Placebos; D011058:Pollen; D006255:Rhinitis, Allergic, Seasonal / Q000276:immunology / Q000628:therapy*; D012621:Seasons; D013997:Time Factors
chemical_list: D000906:Antibodies; D000941:Antigens; D010919:Placebos