title: Modulation of delayed hypersensitivity to PPD by serum factors.
mesh_terms: D003165:Complement System Proteins / Q000032:analysis; D004797:Enzyme-Linked Immunosorbent Assay; D006801:Humans; D006968:Hypersensitivity, Delayed; D007136:Immunoglobulins / Q000032:analysis*; D012882:Skin Tests; D014397:Tuberculosis, Pulmonary / Q000276:immunology*
chemical_list: D007136:Immunoglobulins; D003165:Complement System Proteins