What Is the Difference Between Latent TB Infection and Active TB Disease?

Latent TB Infection Active TB Disease
TB germs are dormant (asleep) in your body. This phase can last for a very long time - even decades. TB germs are reproducing and spreading in your body, causing tissue damage.
You don't look or feel sick. Your chest x-ray usually is normal. You usually feel sick. Typical symptoms include: cough lasting >3 weeks, weight loss, night sweats, and fever. A chest x-ray and other tests are needed to diagnose TB disease.
You can't spread TB to other people. If the TB germs are in your lungs or voicebox, you may spread TB to other people by coughing, sneezing, talking, or singing.
Usually treated by taking one medicine for 9 months. Treated by taking three or four medicines for at least 6 months.

Updated Monday, April 13, 2015 at 01:47PM