title: Effect on tuberculin allergy of tuberculin tests given 18 months earlier.
mesh_terms: D004342:Drug Hypersensitivity; D005260:Female; D006801:Humans; D007115:Immunization Schedule; D008297:Male; D008722:Methods; D013997:Time Factors; D014373:Tuberculin / Q000276:immunology*; D014374:Tuberculin Test
chemical_list: D014373:Tuberculin