The body develops antibodies after getting the flu, but this antibody protection is limited in scope and duration. After getting the flu, the body produces a certain amount of protective antibodies against the influenza virus to prevent the body from being re-infected with the same type of influenza virus. However, the antibodies produced after getting influenza are only effective against that strain of influenza virus, and influenza viruses are particularly susceptible to mutation, so it is not possible to obtain long-lasting immunity after infection, and influenza strains that are prevalent each year are different. In addition, the protective antibody titers produced by the body after getting the flu will gradually decrease over time and lose their protective effect. Therefore, there is still a possibility of getting the flu again after having the flu. In the season of influenza epidemic, you should do a good job of protection, open the windows appropriately, do not gather in crowded places, and exercise appropriately to enhance the body’s resistance and reduce the risk of influenza infection. After suffering from influenza should go to the hospital in a timely manner, under the guidance of the doctor to carry out regular treatment, and improve the patient’s symptoms as soon as possible.