Tuberculosis is a chronic infectious disease of the respiratory tract caused by Mycobacterium tuberculosis. At present, China’s tuberculosis epidemic is still very serious, according to the results of the 2000 national tuberculosis epidemiological sample survey, China’s tuberculosis infection, the country has 550 million people infected; the number of morbidity, there are about 4.5 million active tuberculosis, including about 1.5 million infectious tuberculosis; the number of deaths, about 130,000 people died of tuberculosis, and three-quarters of the tuberculosis patients are the most working The ability of young adults. Therefore, it is of great significance to do a good job of disinfection and isolation protection. The purpose of disinfection and isolation is to apply disinfection and isolation prevention techniques to stop droplet production, reduce the concentration of airborne droplets, reduce people’s exposure to Mycobacterium tuberculosis, prevent airborne droplet transmission and contact transmission, and control the occurrence of TB infection. How is tuberculosis transmitted? The main source of infection is patients with open tuberculosis, i.e., sputum-positive tuberculosis. Transmission is through airborne droplet transmission in close proximity, and contact with contaminated objects can also be transmitted. 1.Airborne droplet transmission Open tuberculosis patients spray droplets containing tuberculosis bacilli into the air when they speak loudly, cough or sneeze, or spit out sputum containing tuberculosis bacilli on the ground, which dries and flies in the air with dust, causing infection by inhaling airborne dust particles and droplets carrying bacteria. 2, contact transmission Through food or eating utensils contaminated with tuberculosis bacteria cause intestinal infection, through the skin wound can also cause infection, but the chance of occurrence is less. In addition to the three conditions necessary for the spread of infectious diseases (i.e., infectious source, transmission route and susceptible population), the onset of infection also depends on the immunity of the body. Therefore, in addition to disinfection and isolation protection for medical personnel, family members of patients, children and the elderly, who are at high risk of contact with patients, they should also strengthen nutrition, pay attention to rest, ensure sleep, improve their immunity, avoid infection and reduce morbidity. What should be done to reduce the infectiousness of patients? Air disinfection is the main source of infection because sputum-positive TB patients are the main source of infection, and TB is mainly spread by airborne droplets, with very little contact transmission, plus the strong resistance of Mycobacterium tuberculosis in vitro, which can survive 6-8 months in dust, and strong resistance to physical and chemical disinfection and sterilization methods. Therefore, air disinfection is very important. Tuberculosis is a chronic infectious disease and has a high incidence, so it is not possible for all patients to be hospitalized; in fact, the vast majority of TB patients are on DOTS (directly supervised short course chemotherapy) at all levels of TB prevention, without hospitalization, and home protection protects family members and people in close contact with the patient, such as colleagues, classmates, and surrounding neighbors.