The only sign of TB infection is a positive reaction to the tuberculin skin test or TB blood test. Persons with latent TB infection are not infectious and cannot spread TB infection to others. Overall, without treatment, about 5 to 10% of infected persons will develop TB disease at some time in their lives.

Is latent TB Serious?

Your Have Latent Tuberculosis Infection (LTBI)

TB disease is very serious. TB disease can kill you. Even if you feel okay now, you must take the medicine your health care provider has prescribed and follow your health care provider's instructions.

How long can you carry latent TB?

Many people who have latent TB infection never develop TB disease. In these people, the TB bacteria remain inactive for a lifetime without causing disease.