The greatest concern of having TB is the fear of infecting others, and likewise the greatest fear of being infected by those in contact with the patient. Therefore, it is necessary to prevent transmission and take protective measures. First of all, the patient should be treated actively. When a patient is found to have tuberculosis and receives effective chemotherapy in time, the number of tuberculosis bacteria in the sputum decreases sharply within a few days and the cough symptoms also decrease and disappear, so the infectiousness of tuberculosis patients decreases and disappears soon after chemotherapy, which is the most active measure to prevent infection. After starting chemotherapy, TB patients who have negative sputum, no obvious symptoms, and who are physically capable of carrying out general work can work and be treated at the same time. Patients may still have TB bacteria in their sputum within two weeks of starting treatment, so it is best to wear a mask, not to spit, and to prepare special sputum bottles when there is a lot of sputum. Open windows frequently, especially in the room where the patient lives, to reduce the concentration of microscopic TB bacteria. Examination of contacts: Contacts of the patient, especially children under 15 years of age in the family, should be promptly examined at TB control facilities, including tuberculin tests and chest imaging.