Generally, only adults with abnormal immunity or elderly people or small children with low immunity are susceptible to TB if they come into contact with a patient who has infectious TB disease. After being infected with tuberculosis bacteria, you may experience noticeable symptoms such as coughing, coughing up sputum, low fever, and night sweats for about two weeks. In fact, most people, especially those with normal immune systems, are generally not infected by occasional contact with infectious TB patients. Even if a normal adult is infected with tuberculosis, a small amount of tuberculosis bacteria will be removed by the body’s immunity, but only long-term contact with a large number of tuberculosis patients or a large amount of tuberculosis bacteria may be infected, so avoiding long-term contact with active tuberculosis patients is the main factor to reduce infectiousness. Patients with infectious tuberculosis need to be isolated and treated, and generally the isolation can be lifted after two weeks of isolation and no infectiousness.