Module 1 – Transmission and Pathogenesis of Tuberculosis 50 Progression to TB Disease (3) People Exposed to TB Not TB Infected Latent TB Infection (LTBI) Not Infectious Positive TST or QFT-G test result Latent TB Infection May go on to develop TB disease Not Infectious Negative TST or QFT-G test result No TB Infection Figure 1.5
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