Drug-resistant tuberculosis is contagious because it is originally diagnosed by bacteria, and mycobacterium tuberculosis can be found in high numbers in the patient’s body. TB is a chronic infectious disease, mainly transmitted through the respiratory tract. When the patient speaks loudly, coughs or sneezes, a large number of tubercle bacilli spread from the respiratory tract, attach themselves to air droplets and remain suspended in the air for a long time. Spitting is the culprit for the transmission of respiratory diseases, and is a vice, people should develop good hygiene habits, not spitting. Not spitting is not the same as swallowing sputum into the stomach, because sputum contains a large number of tuberculosis bacteria, which may lead to intestinal tuberculosis. When sputum is present, it must be spat into a spittoon or wrapped in toilet paper and burned. This is the best way to dispose of sputum, and if the sputum is spat into a spittoon, the spittoon still needs to have 84 disinfectant in it. If a patient with drug-resistant TB is at home, wrapping the sputum in paper and burning it is the best way to dispose of it. Patients should not spit into the bathroom, as Mycobacterium tuberculosis can usually survive for 6-8 months in a dark, damp environment. Patients can also spit into a special handkerchief, which should be cleaned and sterilized before use to minimize contamination of the sputum. Mycobacterium tuberculosis can also be transmitted through the digestive tract. In addition to human beings, cows can also be infected with tuberculosis, and if a cow suffers from tuberculosis, the milk produced by the sick cow will carry Mycobacterium tuberculosis, and if a person consumes milk that contains Mycobacterium tuberculosis, he or she will be infected with tuberculosis, so it is recommended that milk be boiled when consumed in the clinic.