After recovering from influenza, you may still be infected. After recovering from influenza, the body usually produces antibodies in a short period of time, but it is not immune for life. As time goes by, antibody titer decreases and disappears, resistance decreases, and the influenza virus may become infected again. In addition, the influenza virus can mutate. If a mutated strain is produced, the antibodies produced by the previously infected influenza virus will not be effective against the mutated strain, and if you come into contact with the mutated influenza virus, you will still be infected if your body has poor resistance. Therefore, even if you recover from the flu, you will still be infected. If you get infected after recovering from the flu, it is recommended that you go to the hospital promptly and actively cooperate with your doctor for treatment.