Patient detection is an important measure in tuberculosis control, and is also one of the regular tasks of tuberculosis control institutions. To control the epidemic of tuberculosis, we must first control the source of infection, and to control the source of infection, we must first discover the source of infection, so patient detection is extremely important. So, who should be examined for tuberculosis? 1. It is generally believed that persistent cough and sputum for more than three weeks, accompanied by chest pain, hemoptysis and other respiratory symptoms, as well as fever, night sweats, fatigue, poor nutrition, wasting and other symptoms of tuberculosis poisoning should be considered, and further examination is appropriate. However, 20% of patients with active tuberculosis may be asymptomatic or have mild symptoms, and respiratory symptoms and symptoms of tuberculosis toxicity are not characteristic. In some patients, the first symptoms are erythema nodosum, herpetic conjunctiva, keratitis, tuberculosis rheumatism, and other hypersensitive reactive syndromes. A history of previous exposure to tuberculosis is suggestive for diagnosis. 2, there is a history of contact with TB patients, especially those in close contact with the excretory bacteria. 3, the prevalence of tuberculosis in diabetic patients are higher than the general population. In recent years, diabetes has increased, and the age of onset is more than 40 years old, the age of tuberculosis has been postponed to the elderly, so the combination rate is also higher than before, the combination of 2% to 3% in the past, now tends to rise to 11% to 29%, it can be seen that the combination rate of diabetes combined with tuberculosis is very high, should be the focus of the object of X-ray examination, while not only found when diabetes X-ray examination once, because there are 39.5% to 94% of The combination of diabetes mellitus and tuberculosis is found only after the discovery of diabetes mellitus, and it should be examined regularly, once a year. 4. Patients with silicosis are prone to combined tuberculosis, so in addition to X-ray examination, sputum examination should be emphasized for patients with silicosis. It is important to have regular checkups at the time of silicosis diagnosis. 5.The recovery period of children with measles and whooping cough, especially within the first year, should be examined regularly by X-ray. 6.People who take hormones for a long time should undergo X-ray examination regularly. 7.HIV infected person. 8. Those who have seen in the lungs should be examined. Those with inactive pulmonary TB include: ① those who have previously had TB without systematic chemotherapy and are now cured; ② those with fibrotic lesions in the lungs. The annual recurrence rate of this type of inactive tuberculosis is between 0.5% and 2%, so the detection rate of tuberculosis is very high by regular X-ray examination of those who are seen in the lungs.