Tuberculosis is a chronic infectious disease of the lungs caused by infection with Mycobacterium tuberculosis. Its source of infection is mainly the bacillus excretors among TB patients. The infection is spread by droplet transmission of respiratory secretions, such as nasal discharge and sputum, from the infectious agent to the healthy population, who passively inhale the respiratory tract and become infected. Patients with tuberculosis are generally infectious if they have not undergone any treatment or have not undergone standardized treatment. Patients who are clearly diagnosed with tuberculosis can be treated with anti-tuberculosis drugs in a timely and standardized manner for one month, and their infectiousness will be greatly reduced, and most of them are not infectious at all. After the disease is stabilized, you can go home and take oral anti-tuberculosis medication to recuperate properly. Generally, if you have coughing, coughing sputum and unexplained low fever for more than two weeks, you should rule out possible infection with Mycobacterium tuberculosis. You should go to the hospital in time to have the corresponding examination to clarify the diagnosis. You can take x-ray or CT of both lungs, take respiratory secretions to look for Mycobacterium tuberculosis or do culture of Mycobacterium tuberculosis, and do PPd test to make a clear diagnosis. It is necessary to isolate from the healthy population and treat the disease as soon as possible after a clear diagnosis is made, so as to cut off the source of infection and the transmission route to prevent the infection to other healthy people. In China, the first injection of BCG vaccine is given to babies at birth, which can prevent TB infection to a certain extent. Even if the baby is infected with tuberculosis, it can reduce the symptoms of tuberculosis poisoning and prevent the occurrence of severe tuberculosis and tuberculous meningitis.