The flu may still be contagious even after the fever has subsided, and isolation and treatment should continue to be adhered to. If you are infected with influenza virus, even if your fever subsides, it does not mean that the virus has been completely removed from your body. It is only a gradual decrease in the titer of the virus, which leads to a gradual decrease in symptoms, but it is still active and still contagious. The disappearance of fever symptoms does not mean that the disease is over, and anti-influenza virus treatment is still needed. At the same time, in order to avoid further spread of the virus, it is still necessary to insist on isolation, and the general course of influenza requires about 1 week. After the fever disappears completely and there are no other symptoms, the disease may not be contagious. It is recommended to seek medical advice from your doctor.