Prevention of respiratory viral infections is similar to the prevention of other infectious diseases, the three links include controlling the source of infection, cutting off the transmission route, and protecting susceptible people. If all infected persons of the disease are symptomatic or have more severe symptoms, that is, they need to do a good job to control the source of infection in order to control the spread of the disease. For example, in the case of SARS and the Middle East Respiratory Syndrome (MER) that emerged in 2012, the symptoms of the infected persons were more pronounced and all infected persons needed to be isolated to reduce transmission. However, some other respiratory infectious diseases, such as colds, influenza and novel coronavirus pneumonia, often have lightly infected or even asymptomatic infected persons, which are difficult to be identified and cannot be completely controlled as the source of infection. Therefore, the main thing to do is the second link, namely to cut off the transmission route. During the epidemic, all people need to wear a good mask, and go out to places with a lot of people and poor air circulation, all need to wear a good mask for protection. In addition, we need to pay attention to hand hygiene and avoid rubbing eyes and touching nose and mouth after being contaminated by patients’ respiratory secretions. Second, the patient’s feces and urine may also be contagious, so the bathroom also needs to wear a good mask, often open the window ventilation. The third link is the protection of susceptible people, influenza and other respiratory infectious diseases have vaccines, but need to be vaccinated every year. The new coronavirus pneumonia vaccine is not yet available and may take some time. Therefore, the main prevention of the new coronavirus is to isolate the source of infection and cut off the transmission route. Content source: Dr. You Lai