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Annual risk of tuberculosis infection in the Transkei
Abstract
The tuberculin and X-ray survey undertaken in the Transkei by the State Health Service, SANTA, and the Tuberculosis Research Unit of the South African Medical esearch Council was used for a study of the prevalence of tuberculous infection in children from 3 months to 15 years old. The tuberculin test considered was the Mantoux test with 2 TU of human PPD, and an induration of 10 mm was regarded as indicative of a previous tuberculous infection. The combined trend of the risk with age and calendar years was estimated by a mathematical method. The annual risk of tuberculous infection was calculated to be approximately 7%. A downward trend of only 2% per year was seen.
S. Afr. Med. J., 48, 957 (1974).
S. Afr. Med. J., 48, 957 (1974).