There are several types of tuberculosis that are not contagious.

Tuberculosis is an infectious disease of respiratory tract caused by infection of human body by Mycobacterium tuberculosis. The pathogenic microorganism is the infectious source of Mycobacterium tuberculosis. It is a patient with Mycobacterium tuberculosis discharged from the body. only in the following cases can tuberculosis be non-infectious. One is chronic persistent tuberculosis. Generally, there is no mycobacterium in sputum of such patients. In addition, acute tuberculosis is treated with normal standardized intensive treatment for more than four weeks. In general, sputum smears rarely show Mycobacterium tuberculosis. In addition, tuberculosis has formed calcification and fibrous streaks, indicating that the disease of lung damage has been basically repaired and healed. Mycobacterium tuberculosis has been excluded from the body.