Annual risk of tuberculosis infection in the Transkei. Problems connected with its estimation from the data of a tuberculin survey.
D000293:Adolescent; D000367:Age Factors; D002648:Child; D002675:Child, Preschool; D003201:Computers; D006801:Humans; D007223:Infant; D008433:Mathematics; D008722:Methods; D011336:Probability; D013019:South Africa; D013997:Time Factors; D014374:Tuberculin Test; D014397:Tuberculosis, Pulmonary / Q000453:epidemiology*