Correspondence: repository therapy in ragweed hay fever.
D003888:Desensitization, Immunologic; D006801:Humans; D007267:Injections; D008517:Phytotherapy; D010919:Placebos; D011058:Pollen / Q000008:administration & dosage; D006255:Rhinitis, Allergic, Seasonal / Q000628:therapy*; D012882:Skin Tests
D010919:Placebos