What is Tuberculosis? It is a disease caused by bacteria called Mycobacterium tuberculosis. TB spreads through the air when a person with TB of the lungs or throat coughs, sneezes, or talks. So bacteria usually attack the lungs, Because they can also damage other parts of the body.  So Compared with other diseases caused by a single infectious agent, tuberculosis is the second biggest killer, globally. In 2015, 1.8 million people died from the disease, with 10.4 million falling ill. signs of tuberculosis, tuberculosis causes, tuberculosis treatment, tuberculosis symptoms