title: B.C.G. mass vaccination in Tanzania tuberculin allergy--conversion and waning rate.
mesh_terms: D001500:BCG Vaccine; D002648:Child; D004342:Drug Hypersensitivity; D006801:Humans; D006968:Hypersensitivity, Delayed; D007115:Immunization Schedule; D007117:Immunization, Secondary; D012572:School Health Services; D013636:Tanzania; D014374:Tuberculin Test
chemical_list: D001500:BCG Vaccine