There is a risk of being infected with tuberculosis if you share a room with a person with tuberculosis. Tuberculosis is a respiratory tract transmitted disease, if and sputum positive tuberculosis patient, in a room living, working, the patient in coughing, talking, sneezing, the air droplets in the tuberculosis mycobacteria will be their own inhalation, may be infected with the risk of tuberculosis. Therefore, for tuberculosis, isolation treatment is needed, usually until it is not contagious. After regular anti-tuberculosis treatment, tuberculosis is usually not infectious for about two months. It is not absolute, it needs to be decided according to the changes in the patient’s lung CT and the results of the review of sputum.