The tuberculosis bacterium, Mycobacterium tuberculosis, can survive in the air for several hours and can remain infectious for 8-10 days by adhering to dust. In dry sputum, it can survive for 6-8 months. Patients with tuberculosis in their sputum can cough, sneeze, talk loudly, laugh, etc. and spread microscopic droplets of Mycobacterium tuberculosis into the air, and others can be infected after inhaling them. When in contact with a TB patient, a certain distance should be maintained and wearing a mask is an effective measure to stop transmission. Tuberculosis patients should also cover their mouths and noses when coughing or sneezing to avoid spreading the bacteria in the air and infecting others. Tuberculosis patients should spit into a covered spittoon with a disinfectant solution.