Positive influenza A virus antigen may be due to the patient’s infection with influenza A virus. Influenza A is an acute respiratory infectious disease caused by influenza A virus infection, which tends to occur in the fall and winter seasons, is highly contagious, and is mainly transmitted through respiratory droplets. When a patient is infected with this virus, it can lead to influenza in the human body. When patients are infected with influenza A virus, they usually have fever, generalized muscle pain and other symptoms, and can take antiviral drugs such as oseltamivir and ribavirin as prescribed by the doctor for treatment. It is recommended that during the treatment period, patients should pay attention to a light diet, consume more easy-to-digest food, and also consume more vegetables and fruits rich in vitamins. Patients should also pay attention to maintain appropriate exercise to enhance their own resistance and immunity, which will help ease the recovery of the disease.