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Tuberculosis is a chronic infectious disease caused by Mycobacterium tuberculosis, which can involve multiple organs in the body. Tuberculosis is the most common form of tuberculosis (pulmonarytuberculosis). Discharged patients are the source of social infection. Human infection with tuberculosis does not necessarily occur, but only when the resistance is low. The pathological features of this disease are tuberculous nodules and caseous necrosis, which are easy to form cavities. In addition to a few cases of acute onset, most of them show a chronic process clinically. It often has systemic symptoms such as low fever and fatigue, and respiratory manifestations such as cough and hemoptysis. Since 1950s, the total epidemic situation of tuberculosis in China has decreased. However, due to the large population and the unbalanced control of epidemic situation in various areas, it is still an important public health problem and one of the ten leading causes of death in China.


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