Whether tuberculosis will still be contagious after one month of treatment should mainly monitor the sputum test, if the sputum test is positive, it is contagious, while if the sputum test is negative, it is not contagious. Because TB spreads mainly through the respiratory tract, droplet transmission, TB patient sputum can discharge virus, or TB patient coughing, sneezing, talking, laughing, singing and other behaviors, can be in the body of the Mycobacterium tuberculosis microdroplets broadcast into the air, other people in the air after inhalation, there is a risk of infection. Mycobacterium tuberculosis has a strong resistance and can remain infectious for 8-10 days when it adheres to dust, and can survive for 6-8 months in dry sputum. Therefore, TB patients should pay attention to personal hygiene, such as coughing etiquette and not spitting.