1. Tuberculosis is a chronic infectious disease caused by Mycobacterium tuberculosis, which can invade many organs, especially tuberculosis infection. Bacterial secretions are an important source of infection.
2. People may not get sick after being infected with tuberculosis. When the resistance decreases or the cell-mediated allergic reaction increases, it may cause clinical diseases. If it can be diagnosed in time and treated reasonably, most of them can be cured clinically.