Tuberculin Sensitivity of Young Adults in the United States

How Much Control of Tuberculosis: 1937-1957-1977?

“…The average infection rate in Navy recruits at present is 3.5 per cent.2 This may be compared with a rate of 9.1 per cent in the years 1949-1951. 3 The results of scattered tuberculin tests in adult groups seem to show a peak at ages 60 to 70 with 60 per cent positive. Some investigators have surmised that new infections in many parts of the country are now taking place at the extremely low rate of one per 1,000 persons per year.3…”