Tuberculosis is a chronic infectious disease of the respiratory system caused by the infection of Mycobacterium tuberculosis with the immunity of the body. In the absence of standardized treatment, Mycobacterium tuberculosis is continuously discharged, mainly through sputum, and is transmitted to the surrounding healthy people by respiratory route and droplet transmission, which is contagious. However, after two weeks of treatment with standardized anti-tuberculosis drugs, generally there is no more infectiousness, and it is possible to go to school at this time.