what causes tuberculosis

Tuberculosis is caused by a bacterium called Mycobacterium tuberculosis. The bacteria are spread through the air and can infect the lungs or any other part of the body when inhaled. People with active TB disease in the lungs or voice box can spread the disease by releasing tiny droplets that carry the bacteria through the air, which can be inhaled by others, leading to an infection. TB is a contagious infection that usually attacks the lungs but can also spread to other parts of the body, such as the brain and spine