TB is a disease caused by the bacteria Mycobacterium tuberculosis. The bacteria usually attack the lungs, but TB bacteria can attack any part of the body including the kidneys, spine, and brain. People with TB who are not sick have what is called latent TB infection (LTBI). People with TB who become sick have TB disease.
If not treated properly, TB disease can be fatal. There is good news. People with TB disease can be treated if they seek medical help.