Syncytial virus refers to respiratory syncytial virus, which may be caused by airborne droplets, close contact with infectious agents and reduced self-defense. 1. Airborne droplets: syncytial virus can be transmitted through the saliva and sputum of carriers. Patients carrying the virus will produce droplets when coughing, sneezing, or talking, which carry syncytial virus, and if the droplets enter the respiratory tract or enter the oral cavity, it will lead to syncytial virus infection. 2. Close contact with infectious agents: If the patient comes into contact with a patient with respiratory syncytial virus infection, or a patient who is infected with syncytial virus and does not show symptoms, and then does not wash his/her hands and touches his/her eyes, mouth, etc., it can also cause respiratory syncytial virus infection. 3. Reduced self-defense function: Due to the low immune function of children and the elderly, the local defense function of the respiratory tract can be reduced, so that the respiratory syncytial virus carried by the rapid reproduction of the virus can also lead to infection with syncytial virus. If you are infected with respiratory syncytial virus, you need to go to the hospital in time and actively cooperate with the doctor for treatment. Normally, it can be prevented by avoiding contact with the source of infection, paying attention to hygiene and cleanliness at home and avoiding crowded places.