Tuberculosis bacilli may be carried for life. Mycobacterium tuberculosis is possible to carry for life, in the clinic there is a part of mycobacterium tuberculosis latent infection, this kind of people can not have any clinical manifestations, and not infectious, when the patient’s own immunity is lowered, mycobacterium tuberculosis will appear to be the risk of pathogenicity, the ordinary tuberculosis patients in the cure, the patient’s body no longer exists in active tuberculosis bacteria, and does not have the contagiousness. At present, the main way of transmission of tuberculosis bacilli is respiratory transmission, and the source of infection is mainly the sputum of active tuberculosis patients. If a patient is infected with TB bacilli, early and standardized treatment is recommended to reduce the adverse effects of the disease.