It is possible to become infected after contact with a TB patient, and once infected, the infection occurs immediately, but there is usually an incubation period of 4 to 8 weeks, which may be longer in some patients. It is possible to become infected with TB after contact with a TB patient. The probability of infection is especially high for people with lower immunity, such as the elderly, children or patients with underlying diseases. If you are infected after contact with a tuberculosis patient, you will not experience any discomfort at that time because there will be an incubation period, mostly 4-8 weeks, and a few patients may take longer to develop, and you may experience symptoms related to tuberculosis. For example, low fever in the afternoon, fatigue, night sweats, emaciation, cough, sputum, shortness of breath. When these clinical symptoms occur, you should be examined in an infectious disease unit. When in contact with TB patients, one should be careful to wear a mask, and if there is a history of high-risk contact, it is recommended that chest X-ray and PPD test should be performed regularly for screening.