Getting a flu vaccination does not guarantee that you will never get the flu again, because there are many different types of flu viruses and they often mutate. For adults to prevent influenza, they should mainly enhance their physical fitness and immunity, wash their hands regularly, ensure a clean and ventilated environment, minimize activities in crowded places, and avoid contact with patients with respiratory tract infections. When coughing and sneezing, use your arms or tissues or towels to block your mouth and nose when coughing, or wash your hands after sneezing, and try to avoid touching your eyes, nose or mouth. Annual influenza vaccination is recommended as a priority to prevent the occurrence of influenza for elderly people over 60 years of age, as well as children between six months of age and five years of age, and key populations such as pregnant women, patients with chronic diseases and medical personnel.