It is possible to get a second infection from the flu, and the antibodies produced after the flu is cured are not immune for life. Influenza, or influenza, after the flu is cured, the body will produce antibodies to the influenza virus, which are not permanently present in the body and will gradually decrease over time until they disappear. Therefore, after having the flu, you may get infected again. In addition to the short duration of protection by influenza antibodies, influenza viruses are highly mutable and the human body is generally susceptible to influenza viruses, which is why influenza is susceptible to secondary infections. Influenza virus antibodies do not cross-protect against different subtypes of influenza viruses, and an influenza virus antibody is only directed against one subtype of influenza virus, thus making secondary infections easy to occur. During the influenza epidemic season, it is necessary to take good personal protection to reduce the probability of infection.