Firstly, pulmonary tuberculosis is contagious, but it also depends on the type. Generally, pulmonary tuberculosis is most contagious during its active phase, but some patients with fibrosis and in a stable phase are not contagious. The transmission of pulmonary tuberculosis is mainly through droplets, spread by talking, sneezing, or spitting from a tuberculosis patient to a healthy person. However, this droplet transmission has a distance requirement. We believe that a distance of more than 1 meter is relatively safe, and 2 meters is absolutely safe. To prevent the transmission of tuberculosis, it is essential to maintain a distance from tuberculosis patients, wear masks, and ensure frequent ventilation by opening windows.