Tuberculosis is a chronic infectious disease commonly caused by Mycobacterium tuberculosis and is transmitted primarily by respiratory transmission and, rarely, by gastrointestinal transmission or other routes of transmission. The incubation time of tuberculosis varies from person to person and may range from a few weeks to decades, and may even be present for the lifetime of the host. The main route of transmission of tuberculosis is respiratory transmission, i.e. droplet transmission. Tuberculosis-causing bacteria are commonly found in the droplets from the digestive tract of patients with tuberculosis. In addition, it is also possible to spread the pathogenic bacteria through the digestive tract by drinking germ-bearing food such as germ-bearing milk, or to directly infect an open wound due to contact with tuberculosis bacteria, but these transmission routes are relatively uncommon. Second, the incubation period of tuberculosis refers to the incubation period when one has been infected with tuberculosis but does not show obvious symptoms, the length of this period is related to the function of the immune system, usually about a few weeks, but it varies from person to person. In the case of special populations such as children, the elderly, and people who are weak and sickly, the disease may develop rapidly after infection; in the case of strong adults, the incubation period may be longer, in some cases up to several decades or a lifetime without developing the disease. The common manifestations of tuberculosis are prolonged low-grade fever, flushing, coughing with pus and other phlegm, etc. As the disease progresses, serious symptoms such as difficulty in breathing and coughing up blood may even appear. You should also open the windows frequently, exercise, improve your immunity, and go out to avoid getting sick and reduce the probability of infectious diseases.