If you have been in contact with a person with tuberculosis, you do not need to worry too much. The number of infected Mycobacterium tuberculosis bacteria and the immune status of the individual are related to whether or not the disease develops after infection with Mycobacterium tuberculosis. In most people who are infected with Mycobacterium tuberculosis, their own immune system may kill a small amount of Mycobacterium tuberculosis. Because tuberculosis is an infectious disease, if you have coughing and coughing for more than two weeks, you need to be alert to the possibility of being infected with tuberculosis and need to go to the hospital for further chest X-ray or CT examination of the lungs for clarification. If there are suspected TB lesions in the lungs, further sputum examination is required. If the sputum test is also positive, it indicates that the patient is infected with TB. Even if infected, there is no need to worry too much, as TB can be completely cured with regular anti-TB treatment.