Specific and non-specific tuberculin sensitivity in schoolchildren in Poland.
D001500:BCG Vaccine / Q000592:standards*; D002648:Child; D006801:Humans; D006968:Hypersensitivity, Delayed; D011044:Poland; D011786:Quality Control; D012424:Rural Population; D014374:Tuberculin Test / Q000592:standards*; D014505:Urban Population
D001500:BCG Vaccine