Slide 079 Epidemiologic Basis of Tuberculosis Control
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Given tuberculous infection, the risk of progression to tuberculosis for an individual may vary hugely as shown in this selection of risk factors.

An infection acquired a long time ago may carry a risk of about 1 in 1,000 person years.  Recently acquired infection increased the risk ten-fold, and an HIV infection superimposed on a pre-existing tuberculous infection a hundredfold. It is not known how much exactly, but conceivable that an HIV infection preceding acquisition of tuberculous infection may carry a risk of progression in excess of 70%.

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Last update: September 10, 2010