Tuberculosis is not hereditary, but it is contagious. It is mainly transmitted through the respiratory tract. After the sputum of tuberculosis patients who excrete bacteria is dried, the bacteria fly with the dust and are inhaled by others, causing infection. Whether people get sick by inhaling droplets containing mycobacterium tuberculosis is mainly related to the number, toxicity, drug resistance and other factors of inhaled mycobacterium tuberculosis. In addition, the following three modes of transmission will also spread, but less contagious:

1, sharing tableware with tuberculosis patients or eating patients' leftover food is easy to eat mycobacterium tuberculosis, drinking unsterilized milk or dairy products can also infect Mycobacterium bovis, and you may be infected if you don't wash your hands carefully after touching patients' used spittoons.

2. During pregnancy, the mother suffering from tuberculosis can enter the fetus through umbilical cord blood, and the fetus can also be infected by swallowing or inhaling amniotic fluid containing tuberculosis.

3. Tuberculosis is a zoonotic disease. Humans can be infected by animals with tuberculosis when they come into contact with animals such as pigs, cows, sheep, cats and dogs.