Influenza A refers to an acute respiratory infectious disease caused by influenza A virus infection. Influenza A can be prevented by receiving influenza vaccination and paying attention to personal protection. Influenza A is usually acute in onset, and the clinical manifestations of mild cases are often similar to those of the common cold, while severe cases may have various complications such as shock and acute respiratory distress syndrome. The most effective preventive measure against influenza A is influenza vaccination, which can significantly reduce the infection rate and the risk of serious complications in vaccinated persons. In addition to vaccination, attention should also be paid to personal protection in daily life, maintaining good personal hygiene habits, maintaining indoor ventilation, washing hands frequently, and minimizing direct hand contact with the mouth, nose, eyes and other parts of the body. During an influenza outbreak, avoid going to places where people gather, and avoid close contact with patients infected with influenza A. If you are infected with influenza A, you should avoid going to places where people gather. If you are infected with influenza A virus, you should isolate yourself and go to the hospital for treatment in a timely manner.