Part of the tuberculosis is not infectious, clinically more common is after standardized treatment for more than two weeks after the initial infection of tuberculosis, generally not infectious, then you can sputum test the patient’s own tuberculosis mycobacteria whether or not the existence of the mycobacterium tuberculosis, or to do the culture of the tuberculosis mycobacterium is also negative. In addition, although infected with Mycobacterium tuberculosis, but due to the improvement of the patient’s own immunity, the immune system is more complete can be self-healing, this case of tuberculosis is also not infectious. In this case, TB is not contagious. Clinically, X-rays of both lungs, PPD test and sputum test are used to determine whether TB is contagious or not, so that the treatment program can be adjusted at any time.