The germs that cause Tuberculosis (TB) disease can make you very sick. But if your body can suppress the germs, you will stay well. This is called latent tuberculosis infection (LTBI).TB is a condition that usually affects the lungs. TB can also affect other parts of the body such as the glands, bones or brain.
TB is caused by a bacterium (germ). When someone with TB in their lungs coughs or sneezes, the germs can pass into the air. These germs may be breathed in by other people. The germs can then damage the lungs or other parts of the body and make the person very sick. This is called TB disease.
In people with LTBI, the body's immune system is able to suppress the TB germs, causing the germs become inactive (latent). As long as the germs are inactive, the person stays perfectly well. TB disease can be cured by medication.