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  • TB Infection

    Learning Objectives

    Provide the operational definition of TB infection.

    Indicate the previous term Latent TB infection.

    Describe how this stage in a person's life is identified.

    Discuss the importance of this stage and implication for treatment. 

  • It is a state of persistent immune response to stimulation by Mycobacterium tuberculosis antigens with no evidence of clinically manifested active TB.

  • There is no single acceptable/reliable test for direct identification of Mycobacterium tuberculosis infection in humans. Tuberculin Skin Test (TST) and Interferon-gamma release assay (IGRA) are commonly used tests for identifying TB infection.

  • The vast majority of infected people may never develop TB disease. However, to achieve TB elimination, it is important to treat TB infection in people at risk of developing active TB disease.


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