Influenza is generally highly contagious. Influenza is generally due to influenza virus infection caused by the respiratory tract infectious diseases, contagious is relatively strong, and the speed of transmission is relatively fast, can cause aggregation of infection, such as family, business, groups and other aggregation of infection. Influenza is highly contagious, so pay attention to prevention, pay attention to wear a mask when contacting the patient, do not go to the gathering of people, at the same time, to keep doors and windows ventilated, the environment should pay attention to the disinfection process. Influenza spreads quickly, and some can even cause severe influenza. People with low immunity can get a flu shot before the flu season to prevent influenza virus infection.