Diagnosis of Latent TB Infection and TB Disease

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This fact sheet, available online or via fax only, discusses the tuberculin skin test and when to suspect TB disease. Specifically, it discusses administering the tuberculin skin test, interpreting the results, false-positive and false-negative results, two-step testing, anergy, and interpreting reactions in persons vaccinated with BCG.

Author:

CDC NCHHSTP Division of Tuberculosis Elimination, Centers for Disease Control and Prevention (CDC), National Center for HIV/AIDS Viral Hepatitis STD and TB Prevention, Division of Tuberculosis Elimination

Audiences:

Infection Control and Occupational Health Workers

Topic:

BCG Vaccine, Diagnosis, TB Skin Test, Diagnosis- Laboratory Procedures