Whether kissing a tuberculosis patient can lead to transmission depends on the patient's condition. Tuberculosis is a chronic infectious disease of the lungs caused by Mycobacterium tuberculosis. It is primarily spread through respiratory droplets, with the source of infection being patients in the active phase who are shedding the bacteria. Generally, patients who exhibit symptoms such as coughing and sputum production, and who have not undergone standard treatment or have been on anti-tuberculosis medication for less than a month, are potential sources of infection. The bacteria are continuously expelled from the respiratory tract, and through kissing, they can be transmitted to healthy individuals. Clinically, respiratory secretions from patients are typically collected to test for or culture Mycobacterium tuberculosis. If the results are negative, it indicates that the patient is temporarily non-infectious, and kissing would not pose a risk of transmission to healthy individuals at that time.